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首页 > 化学产品 > 4-乙酰氧基氮杂环丁酮
76855-69-1

4-乙酰氧基氮杂环丁酮

CAS：76855-69-1

中文别名：(3R,4R)-4-乙酰氧基-3-[(R)-叔丁基二甲硅氧基)乙基]-2-氮杂环丁酮,(3R,4R)-3-(R)-1-叔丁基二甲基硅氧乙基-4-乙酰氧基氮杂环丁-2-酮,(3R,4R)-4-乙酰氧基-3-[(R)-1-(叔丁基二甲基硅氧基)乙基]-2-氮杂环丁酮,4-乙酰氧基-3-[1-(叔丁基二甲基硅氧基)乙基]氮杂环丁酮,氮杂环酮 4-AA,2-氮杂环丁酮,4-乙酰氧基-3-[(1R)-1-[[(1,1-二甲基乙,[3R(1'R,4R)]-(+)-4-乙酰氧基-3-[1-(叔丁基二甲基硅氧基)乙基]-2-氮杂环丁酮,AOSA(4-AA),氮杂环酮,氮杂环酮 4-AA 、 ACETOXYAZETIDINONE

英文别名：(3S,4R)-4-Acetoxy-3-[(R)-1-(tert-butyldimethylsilyloxy)ethyl]azetidin-2-one

英文名：4-acetoxyazetidin-2-one

分子式：C13H25NO4Si

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货期
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现货 1-3天 3-5天 1周 1-2周 1月

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纯度
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98% 96% 95% 95+% 99% 99.50% 97+% 98.0% 0.99

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广奥 信康 万得 巨胜 恒昌 齐飞 实顺 贞田

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4-乙酰氧基氮杂环丁酮
4-乙酰氧基氮杂环丁酮

品牌：巨胜

纯度：99.50%

规格： 25kg

CAS：76855-69-1

货期： 2日

发货地：湖北,天门,黄潭

湖北巨胜科技有限公司

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4-乙酰氧基氮杂环丁酮
4-乙酰氧基氮杂环丁酮

品牌：齐飞

纯度：99.50%

规格： 25kg

CAS：76855-69-1

货期： 2日

发货地：湖北,天门,黄潭

湖北齐飞医药化工有限公司

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4-乙酰氧基氮杂环丁酮 源头工厂 质量保障
4-乙酰氧基氮杂环丁酮 源头工厂 质量保障

品牌：贞田

纯度：0.99

规格： 1kg

CAS：76855-69-1

货期： 1日

发货地：河北,邢台,贞田产业园

河北贞田食品添加剂有限公司

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￥98
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4-乙酰氧基氮杂环丁酮
4-乙酰氧基氮杂环丁酮

品牌：-

纯度：98%

规格： 1g

CAS：76855-69-1

货期： 1日

JACS-郑州杰克斯化工产品有限公司

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4-乙酰氧基氮杂环丁酮
4-乙酰氧基氮杂环丁酮

品牌：恒昌

纯度：99.50%

规格： 25kg

CAS：76855-69-1

货期： 2日

发货地：湖北,天门,黄潭

天门恒昌化工有限公司

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4-乙酰氧基氮杂环丁酮
4-乙酰氧基氮杂环丁酮

品牌：信康

纯度：99.50%

规格： 25kg

CAS：76855-69-1

货期： 2日

发货地：湖北,天门,黄潭

湖北信康医药化工有限公司

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4-乙酰氧基氮杂环丁酮
4-乙酰氧基氮杂环丁酮

品牌：万得

纯度：99.50%

规格： 25kg

CAS：76855-69-1

货期： 2日

发货地：湖北,天门,黄潭

湖北万得化工有限公司

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4-乙酰氧基氮杂环丁酮
4-乙酰氧基氮杂环丁酮

品牌：实顺

纯度：99.50%

规格： 25kg

CAS：76855-69-1

货期： 2日

发货地：湖北,天门,黄潭

湖北实顺生物科技有限公司

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4-乙酰氧基氮杂环丁酮
4-乙酰氧基氮杂环丁酮

品牌：-

纯度：98%

规格： 1g

CAS：76855-69-1

货期： 7日

爱斯特（成都）生物制药股份有限公司

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4-乙酰氧基氮杂环丁酮
4-乙酰氧基氮杂环丁酮

品牌：-

纯度：99%

规格： 1kg

CAS：76855-69-1

货期： 2日

济南温莎医药科技有限公司

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(2R,3R)-3-((R)-1-((tert-Butyldimethylsilyl)oxy)ethyl)-4-oxoazetidin-2-yl acetate
(2R,3R)-3-((R)-1-((tert-Butyldimethylsilyl)oxy)ethyl)-4-oxoazetidin-2-yl acetate

品牌：-

纯度：95+%

规格： 5g

CAS：76855-69-1

货期： 3日

上海毕得医药科技有限公司

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4-乙酰氧基氮杂环丁酮
4-乙酰氧基氮杂环丁酮

品牌：-

纯度：99%

规格： 1kg

CAS：76855-69-1

货期： 现货

武汉嘉凯隆科技发展有限公司

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4-乙酰氧基氮杂环丁酮
4-乙酰氧基氮杂环丁酮

品牌：-

纯度：99%

规格： 25kg

CAS：76855-69-1

货期： 3日

佛山市道麒生物科技有限公司

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4-乙酰氧基氮杂环丁酮
4-乙酰氧基氮杂环丁酮

品牌：-

纯度：99%

规格： 25kg

CAS：76855-69-1

货期： 7日

重庆赛普那斯科技有限公司

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4-乙酰氧基氮杂环丁酮
4-乙酰氧基氮杂环丁酮

品牌：-

纯度：95+%

规格： 10g

CAS：76855-69-1

货期： 7日

上海毕得医药科技有限公司

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4-乙酰氧基氮杂环丁酮
4-乙酰氧基氮杂环丁酮

品牌：-

纯度：95+%

规格： 10g

CAS：76855-69-1

货期： 7日

上海毕得医药科技有限公司

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4-乙酰氧基氮杂环丁酮
4-乙酰氧基氮杂环丁酮

品牌：-

纯度：98.0%

规格： 5g

CAS：76855-69-1

货期： 10日

上海鼎淼化学科技有限公司

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(3R,4R)-4-乙酰氧基-3-[(R)-1-(叔丁基二甲基硅氧基)乙基]-2-氮杂环丁酮
(3R,4R)-4-乙酰氧基-3-[(R)-1-(叔丁基二甲基硅氧基)乙基]-2-氮杂环丁酮

品牌：-

纯度：97+%

规格： 100g

CAS：76855-69-1

货期： 7日

上海思域化工科技有限公司

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4-乙酰氧基氮杂环丁酮
4-乙酰氧基氮杂环丁酮

品牌：-

纯度：98%

规格： 5g

CAS：76855-69-1

货期： 7日

TCI-梯希爱（上海）化成工业发展有限公司

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4-乙酰氧基氮杂环丁酮
4-乙酰氧基氮杂环丁酮

品牌：-

纯度：98%

规格： 5g

CAS：76855-69-1

货期： 7日

上海登驰国际贸易有限公司

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上游产品词典
乙醛 叔丁基二甲基氯硅烷 (1'R,3S)-3-<1'-<(tert-butyldimethylsilyl)oxy>ethyl>azetidin-2-one [3S-[3α(S*),4β]]-3-(1-t-butyldimethylsilyloxyethyl)-4-acetyl-2-azetidinone (2R,3R)-3-((R)-1-(tert-butyldimethylsilyloxy)ethyl)-1-(4-methoxyphenyl)-4-oxoazetidin-2-yl acetate
下游产品词典
p-nitrobenzyl (5R,6S)-6-<(1R)-(tert-butyldimethylsiloxy)ethyl>-2-<(2R)-N-p-nitrobenzyloxycarbonylpyrrolidin-2-yl>-2-penem-3-carboxylate p-nitrobenzyl 2-<(3S,4R)-3-<(1R)-(tert-butyldimethylsiloxy)ethyl>-4-<((2S)-N-p-nitrobenzyloxycarbonylazeitidin-2-yl)acetylthio>-2-oxoazetidin-1-yl>-2-hydroxyacetate p-nitrobenzyl (5R,6S)-6-<(1R)-hydroxyethyl>-2-<((RS)-N-p-nitrobenzyloxycarbonylpiperidin-2-yl)methyl>-2-penem-3-carboxylate (5R,6S)-6-<(1R)-hydroxyethyl>-2-ethyl-2-penem-3-carboxylic acid sodium salt p-nitrobenzyl 2-<(3S,4R)-3-<(1R)-(tert-butyldimethylsiloxy)ethyl>-4-propionylthio-2-oxoazetidin-1-yl>-2-hydroxyacetate p-nitrobenzyl (5R,6S)-6-<(1R)-hydroxyethyl>-2-ethoxymethyl-2-penem-3-carboxylate p-nitrobenzyl (5R,6S)-6-<(1R)-hydroxyethyl>-2-ethyl-2-penem-3-carboxylate (3S,4R)-4-[1-Buten-3(S)-yl]-3-[(1R)-1-(tert-butyldimethylsilyloxy)ethyl]-2-azetidinone allyl (1S,5S,8aS,8bR)-1-((R)-1-hydroxyethyl)-5-isopropoxy-2-oxo-1,2,5,6,7,8,8a,8b-octahydroazeto[2,1-a]isoindole-4-carboxylate allyl (1S,5S,8aS,8bR)-5-ethoxy-1-((R)-1-hydroxyethyl)-2-oxo-1,2,5,6,7,8,8a,8b-octahydroazeto[2,1-a]isoindole-4-carboxylate allyl (1S,5S,8aS,8bR)-1-((R)-1-((tert-butyldimethylsilyl)oxy)ethyl)-5-isopropoxy-2-oxo-1,2,5,6,7,8,8a,8b-octahydroazeto[2,1-a]isoindole-4-carboxylate allyl (1S,5S,8aS,8bR)-1-((R)-1-((tert-butyldimethylsilyl)oxy)ethyl)-5-ethoxy-2-oxo-1,2,5,6,7,8,8a,8b-octahydroazeto[2,1-a]isoindole-4-carboxylate [(3S,4S)-3-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-2-oxo-4-((R)-4-oxo-tetrahydro-thiopyran-3-yl)-azetidin-1-yl]-oxo-acetic acid allyl ester [(3S,4S)-3-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-2-oxo-4-((S)-4-oxo-tetrahydro-thiopyran-3-yl)-azetidin-1-yl]-oxo-acetic acid allyl ester (2S,2aS,2bS)-2-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-1-oxo-2,2a,2b,3,5,6-hexahydro-1H-4-thia-7a-aza-cyclobuta[a]indene-7-carboxylic acid allyl ester (2S,2aS,2bR)-2-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-1-oxo-2,2a,2b,3,5,6-hexahydro-1H-4-thia-7a-aza-cyclobuta[a]indene-7-carboxylic acid allyl ester allyl (5S,6S,7S)-5-[(R)-1-hydroxyethyl]-4-oxo-9-thia-3-azatricyclo[5.4.0.03,6 ]undec-1-ene-2-carboxylate allyl (5S,6S,7R)-5-[(R)-1-hydroxyethyl]-4-oxo-9-thia-3-azatricyclo[5.4.0.03,6 ]undec-1-ene-2-carboxylate (3S,4S)-3-((R)-(1-(tert-butyldimethylsilyl)oxy)ethyl)-4-((3R)-4-oxotetrahydro-4H-thiopyrane-3-yl)azetidine-2-one (3S,4S)-3-((R)-(1-(tert-butyldimethylsilyl)oxy)ethyl)-4-((3S)-4-oxotetrahydro-4H-thiopyrane-3-yl)azetidine-2-one (5R,6S)-6-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-7-oxo-3-(S)-tetrahydro-furan-2-yl-4-thia-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid allyl ester (5R,6S)-6-((R)-1-hydroxyethyl)-2-[(1-tetrahydro-2-furyl)ethyl]penem-3-carboxylic acid allyl ester (3S,4R)-4-Allyl-1-[4-(tert-butyl-dimethyl-silanyloxy)-but-2-ynyl]-3-[(R)-1-(tert-butyl-dimethyl-silanyloxy)-ethyl]-azetidin-2-one (3S,4R)-4-Allyl-3-[(R)-1-(tert-butyl-dimethyl-silanyloxy)-ethyl]-1-but-2-ynyl-azetidin-2-one (1S,5R,8aS,8bR)-1-((R)-1-Hydroxy-ethyl)-5-methoxy-2-oxo-1,2,5,6,7,8,8a,8b-octahydro-azeto[2,1-a]isoindole-4-carboxylic acid allyl ester (2S,2aS,2bS)-2-((R)-1-Hydroxy-ethyl)-1-oxo-1,2,2a,2b,5,6-hexahydro-4H-3-oxa-7a-aza-cyclobuta[a]indene-7-carboxylic acid allyl ester (2S,2aS,2bR)-2-((R)-1-Hydroxy-ethyl)-1-oxo-1,2,2a,2b,5,6-hexahydro-4H-3-oxa-7a-aza-cyclobuta[a]indene-7-carboxylic acid allyl ester (3S,4R)-3-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-4-((1R,3R)-3-methoxy-2-oxo-cyclohexyl)-azetidin-2-one (4R,5R,6S)-4-[2-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-6-[(R)-1-(tert-butyl-dimethyl-silanyloxy)-ethyl]-3-(diphenoxy-phosphoryloxy)-7-oxo-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid allyl ester Sodium (5R,6S)-1,1-dimethyl-6-<(R)-1-hydroxyethyl>-2-(1,3,4-thiadiazol-2-yl)thiomethylcarbapen-2-em-3-carboxylate (5R,6S)-6-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-2-methyl-1-aza-bicyclo[3.2.0]hept-2-en-7-one (3S,4S)-4-(1-methylallenyl)-3-[(R)-1-(tert-butyldimethylsilyloxy)ethyl]-2-azetidinone (5R,6S)-6-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-1-aza-bicyclo[3.2.0]hept-3-en-7-one (3S,4R)-3-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-4-but-2-ynyl-azetidin-2-one Acetic acid (2R,3R)-1-[((Z)-but-2-enyl)-dimethyl-silanyl]-3-[(R)-1-(tert-butyl-dimethyl-silanyloxy)-ethyl]-4-oxo-azetidin-2-yl ester (3S,4R)-4-[4-(allyloxycarbonyl)-1-benzyl-3-oxopiperidin-4-yl]-3-[(R)-1-(tert-butyldimethylsilyloxy)ethyl]-2-azetidinone (5S,6S)-6-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-4-vinyl-1-aza-bicyclo[3.2.0]hept-3-en-7-one 2-{(2R,3S)-3-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-4-oxo-azetidin-2-yl}-3,4,5,6,7,8-hexahydro-2H-acridin-1-one 2-{(2R,3S)-3-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-4-oxo-azetidin-2-yl}-3,4-dihydro-2H-acridin-1-one (5R,6S)-6-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-3-[3-(tert-butyl-dimethyl-silanyloxy)-propylsulfanyl]-7-oxo-4-thia-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid 4-nitro-benzyl ester (5R,6S)-6-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-3-(3-hydroxy-propylsulfanyl)-7-oxo-4-thia-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid 4-nitro-benzyl ester (5S,6S)-6-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-3-(3-hydroxy-propylsulfanyl)-7-oxo-4-thia-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid 4-nitro-benzyl ester (5R,6S)-6-((R)-1-Hydroxy-ethyl)-3-(3-hydroxy-propylsulfanyl)-7-oxo-4-thia-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid 4-nitro-benzyl ester (5R,6S)-6-((S)-1-Hydroxy-ethyl)-3-(3-hydroxy-propylsulfanyl)-7-oxo-4-thia-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid 4-nitro-benzyl ester (5S,6S)-3-(4-Amino-butylsulfanyl)-6-((R)-1-hydroxy-ethyl)-7-oxo-4-thia-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid (5R,6S)-3-(4-Amino-butylsulfanyl)-6-((R)-1-hydroxy-ethyl)-7-oxo-4-thia-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid p-nitrobenzyl 2-<(3S,4R)-3-<(1R)-(tert-butyldimethylsiloxy)ethyl>-4-<<(2S)-N-p-nitrobenzyloxycarbonylpyrrolidin-2-yl>carbonylthio>-2-oxoazetidin-1-yl>-2-triphenylphosphoranylideneacetate p-nitrobenzyl 2-<(3S,4R)-3-<(1R)-(tert-butyldimethylsiloxy)ethyl>-4-(5-p-nitrobenzyloxycarbonylaminopentanoylthio)-2-oxoazetidin-1-yl>-2-triphenylphosphoranylideneacetate {(2R,3S)-3-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-2-[3-(tert-butyl-dimethyl-silanyloxy)-propylsulfanylthiocarbonylsulfanyl]-4-oxo-azetidin-1-yl}-(triphenyl-λ5-phosphanylidene)-acetic acid 4-nitro-benzyl ester (S)-2-{(2R,3S)-3-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-1-[chloro-(4-nitro-benzyloxycarbonyl)-methyl]-4-oxo-azetidin-2-ylsulfanylcarbonyl}-pyrrolidine-1-carboxylic acid 4-nitro-benzyl ester p-nitrobenzyl 2-<(3S,4R)-3-<(1R)-(tert-butyldimethylsiloxy)ethyl>-4-<<(2S)-N-p-nitrobenzyloxycarbonylpyrrolidin-2-yl>carbonylthio>-2-oxoazetidin-1-yl>-2-hydroxyacetate dl-p-nitrobenzyl 2-<(3R*,4S*)-3-<(1R*)-(tert-butyldimethylsiloxy)ethyl>-4-(5-p-nitrobenzyloxycarbonylaminopentanoylthio)-2-oxoazetidin-1-yl>-2-hydroxyacetate (5R,6S)-6-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-3-[4-(4-nitro-benzyloxycarbonylamino)-butylsulfanyl]-7-oxo-4-thia-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid 4-nitro-benzyl ester (5S,6S)-6-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-3-[4-(4-nitro-benzyloxycarbonylamino)-butylsulfanyl]-7-oxo-4-thia-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid 4-nitro-benzyl ester (5R,6S)-6-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-3-[3-(4-nitro-benzyloxycarbonylamino)-propylsulfanyl]-7-oxo-4-thia-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid 4-nitro-benzyl ester (5S,6S)-6-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-3-[3-(4-nitro-benzyloxycarbonylamino)-propylsulfanyl]-7-oxo-4-thia-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid 4-nitro-benzyl ester p-nitrobenzyl (5R,6S)-6-<(1R)-(tert-butyldimethylsiloxy)ethyl>-2-(4-p-nitrobenzyloxycarbonylaminobutan-1-yl)-2-penem-3-carboxylate (5S,6S)-6-((R)-1-Hydroxy-ethyl)-3-[4-(4-nitro-benzyloxycarbonylamino)-butylsulfanyl]-7-oxo-4-thia-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid 4-nitro-benzyl ester (5R,6S)-6-((R)-1-Hydroxy-ethyl)-3-[4-(4-nitro-benzyloxycarbonylamino)-butylsulfanyl]-7-oxo-4-thia-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid 4-nitro-benzyl ester {(2R,3S)-3-[(S)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-2-[3-(tert-butyl-dimethyl-silanyloxy)-propylsulfanylthiocarbonylsulfanyl]-4-oxo-azetidin-1-yl}-hydroxy-acetic acid 4-nitro-benzyl ester (5S,6S)-6-((R)-1-Hydroxy-ethyl)-3-[3-(4-nitro-benzyloxycarbonylamino)-propylsulfanyl]-7-oxo-4-thia-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid 4-nitro-benzyl ester (5R,6S)-6-((R)-1-Hydroxy-ethyl)-3-[3-(4-nitro-benzyloxycarbonylamino)-propylsulfanyl]-7-oxo-4-thia-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid 4-nitro-benzyl ester p-nitrobenzyl (5R,6S)-6-<(1R)-hydroxyethyl>-2-(4-p-nitrobenzyloxycarbonylaminobutan-1-yl)-2-penem-3-carboxylate Sodium; (5R,6S)-6-((R)-1-hydroxy-ethyl)-3-(3-hydroxy-propylsulfanyl)-7-oxo-4-thia-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylate {(2R,3S)-3-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-2-[4-(4-nitro-benzyloxycarbonylamino)-butylsulfanylthiocarbonylsulfanyl]-4-oxo-azetidin-1-yl}-(triphenyl-λ5-phosphanylidene)-acetic acid 4-nitro-benzyl ester {(2R,3S)-3-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-2-[3-(4-nitro-benzyloxycarbonylamino)-propylsulfanylthiocarbonylsulfanyl]-4-oxo-azetidin-1-yl}-(triphenyl-λ5-phosphanylidene)-acetic acid 4-nitro-benzyl ester p-nitrobenzyl 2-<(3S,4R)-3-<(1R)-(tert-butyldimethylsiloxy)ethyl>-4-(4-p-nitrobenzyloxycarbonylaminobutyrylthio)-2-oxoazetidin-1-yl>-2-triphenylphosphoranylideneacetate p-nitrobenzyl 2-<(3S,4R)-3-<(1R)-(tert-butyldimethylsiloxy)ethyl>-4-(3-p-nitrobenzyloxycarbonylaminopropionylthio)-2-oxoazetidin-1-yl>-2-triphenylphosphoranylideneacetate {(2R,3S)-3-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-2-[4-(4-nitro-benzyloxycarbonylamino)-butylsulfanylthiocarbonylsulfanyl]-4-oxo-azetidin-1-yl}-hydroxy-acetic acid 4-nitro-benzyl ester {(2R,3S)-3-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-2-[3-(4-nitro-benzyloxycarbonylamino)-propylsulfanylthiocarbonylsulfanyl]-4-oxo-azetidin-1-yl}-hydroxy-acetic acid 4-nitro-benzyl ester p-nitrobenzyl 2-<(3S,4R)-3-<(1R)-(tert-butyldimethylsiloxy)ethyl>-4-(4-p-nitrobenzyloxycarbonylaminobutyrylthio)-2-oxoazetidin-1-yl>-2-hydroxyacetate p-nitrobenzyl 2-<(3S,4R)-3-<(1R)-(tert-butyldimethylsiloxy)ethyl>-4-(3-p-nitrobenzyloxycarbonylaminopropionylthio)-2-oxoazetidin-1-yl>-2-hydroxyacetate p-nitrobenzyl (5R,6S)-6-<(1R)-(tert-butyldimethylsiloxy)ethyl>-2-(3-p-nitrobenzyloxycarbonylaminopropan-1-yl)-2-penem-3-carboxylate p-nitrobenzyl (5R,6S)-6-<(1R)-(tert-butyldimethylsiloxy)ethyl>-2-(2-p-nitrobenzyloxycarbonylaminoethyl)-2-penem-3-carboxylate p-nitrobenzyl (5R,6S)-6-<(1R)-hydroxyethyl>-2-(3-p-nitrobenzyloxycarbonylaminopropan-1-yl)-2-penem-3-carboxylate p-nitrobenzyl (5R,6S)-6-<(1R)-hydroxyethyl>-2-(2-p-nitrobenzyloxycarbonylaminoethyl)-2-penem-3-carboxylate (5R,6S)-3-(3-Azido-propylsulfanyl)-6-[(R)-1-(tert-butyl-dimethyl-silanyloxy)-ethyl]-7-oxo-4-thia-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid 4-nitro-benzyl ester (5R,6S)-3-(3-Azido-propylsulfanyl)-6-((R)-1-hydroxy-ethyl)-7-oxo-4-thia-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid 4-nitro-benzyl ester (3S,4R)-3-<(1R)-(tert-butyldimethylsiloxy)ethyl>-4-<3-(p-nitrobenzyloxycarbonylamino)propionylthio>azetidin-2-one (3S,4S)-3-<(R)-1-(t-butyldimethylsilyloxy)ethyl>-4-carbamoyl-2-azetidinone 2-Acetyl-2-{(2S,3S)-1-allyloxyoxalyl-3-[(R)-1-(tert-butyl-dimethyl-silanyloxy)-ethyl]-4-oxo-azetidin-2-yl}-pent-4-enoic acid ethyl ester {(2R,3S)-3-[(S)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-2-[2-(4-nitro-benzyloxycarbonylamino)-ethylsulfanylthiocarbonylsulfanyl]-4-oxo-azetidin-1-yl}-hydroxy-acetic acid 4-nitro-benzyl ester 2-Oxo-propionic acid (2R,3R)-1-[benzyloxycarbonyl-(triphenyl-λ5-phosphanylidene)-methyl]-3-((R)-1-hydroxy-ethyl)-4-oxo-azetidin-2-yl ester 4-Nitrobenzyl (2-{[(allyloxy)carbonyl]amino}-4-{[(2R,3S)-3-((1R)-1-{[tert-butyl(dimethyl)silyl]oxy}ethyl)-4-oxoazetidin-2-yl]acetyl}phenyl)acetate 4-nitrobenzyl (4-{[(2R,3S)-3-((1R)-1-{[tert-butyl(dimethyl)silyl]oxy}ethyl)-4-oxoazetidin-2-yl]acetyl}-2-chlorophenyl)acetate ethyl 4-((2R,3S)-3-((R)-1-((tert-butyldimethylsilyl)oxy)ethyl)-4-oxoazetidin-2-yl)but-2-ynoate (3S,4R)-3-[(R)-1-(tert-butyldimethylsilyloxy)ethyl]-4-[2-(trimethylsilyl)ethylseleno]-2-azetidinone 3-(S)-[1-(R)-(tert-butyldimethylsilyloxy)-ethyl]-4-(R)-((1R,3S)-3-butoxy-2-oxo-cyclohexyl)-azetidin-2-one 3-(S)-[1-(R)-(tert-butyldimethylsilyloxy)-ethyl]-4-(R)-((1S,3R)-3-butoxy-2-oxo-cyclohexyl)-azetidin-2-one {(2R,3S)-3-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-4-oxo-azetidin-2-yl}-thioacetic acid S-((S)-1-{1-[(Z)-4-nitro-benzyloxycarbonylimino]-ethyl}-pyrrolidin-3-yl) ester phosphoric acid 5-{(3S,4R)-3-[(R)-1-tert-butyldimethylsilyloxyethyl]-2-oxo-4-azetidinyl}pent-2-ynyl ester diethyl ester (2S,2aS,2bR,5aR,6S)-5a-Benzenesulfonyl-2-[(R)-1-(tert-butyl-dimethyl-silanyloxy)-ethyl]-2b-methyl-1-oxo-octahydro-3-oxa-6a-aza-cyclobuta[a]pentalene-6-carboxylic acid benzyl ester (2S,2aS,2bR,5aR,6S)-2-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-2b-methyl-1,4-dioxo-5a-phenylsulfanyl-octahydro-3-oxa-6a-aza-cyclobuta[a]pentalene-6-carboxylic acid benzyl ester (2aS,2bS,5aS,6R)-2-Eth-(Z)-ylidene-2b-methyl-1,4-dioxo-octahydro-3-oxa-6a-aza-cyclobuta[a]pentalene-6-carboxylic acid benzyl ester {(2R,3S)-2-Benzoylsulfanyl-3-[(R)-1-(tert-butyl-dimethyl-silanyloxy)-ethyl]-4-oxo-azetidin-1-yl}-oxo-acetic acid allyl ester [(2R,3S)-3-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-2-(2,2-dimethyl-thiopropionylsulfanyl)-4-oxo-azetidin-1-yl]-oxo-acetic acid 4-nitro-benzyl ester (4R,5R,6S)-6-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-3-(diphenoxy-phosphoryloxy)-4-methyl-7-oxo-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid allyl ester (5R,6S)-6-<(1R)-hydroxyethyl>-2-(2-aminoethyl)-2-penem-3-carboxylic acid {(2R,3S)-3-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-4-oxo-azetidin-2-yl}-thioacetic acid S-isopropyl ester (3S,4R)-3-[(R)-1-Hydroxyethyl]-4-[(phenylthio)carbonylmethyl]-2-azetidinone S-(2R,3S)-3-[(1R)-1-(tert-butyldimethylsilanyloxy)ethyl]-1-(methylthio)-4-oxoazetidin-2-yl ethanethioate S-(2R,3S)-3-((1R)-1-hydroxyethyl)-1-(methylthio)-4-oxoazetidin-2-yl ethanethioate (3S)-3-[(1S)-1-(benzoyloxy)ethyl]azetidin-2-one 1-(4-{[(2R,3S)-3-((1R)-1-{[tert-butyl(dimethyl)silyl]oxy}ethyl)-4-oxoazetidin-2-yl]acetyl}phenyl)-3-methylimidazolidin-2-one 2-Allyl-2-{(2S,3S)-1-allyloxyoxalyl-3-[(R)-1-(tert-butyl-dimethyl-silanyloxy)-ethyl]-4-oxo-azetidin-2-yl}-malonic acid diethyl ester (2S,2aS,2bR)-2-((R)-1-Methanesulfonyloxy-ethyl)-1-oxo-2,2a,2b,3,5,6-hexahydro-1H-4-thia-7a-aza-cyclobuta[a]indene-7-carboxylic acid allyl ester (1S,6S,8aS,8bR)-1-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-6-[2-(tert-butyl-dimethyl-silanyloxy)-ethyl]-2-oxo-1,2,5,6,7,8,8a,8b-octahydro-azeto[2,1-a]isoindole-4-carboxylic acid benzyl ester ((1R,4R)-4-{(2R,3S)-1-(tert-Butyl-dimethyl-silanyl)-3-[(R)-1-(tert-butyl-dimethyl-silanyloxy)-ethyl]-4-oxo-azetidin-2-yl}-3-oxo-cyclohexyl)-acetaldehyde (1S,5R,8aS,8bR)-1-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-5-methoxy-2-oxo-1,2,5,6,7,8,8a,8b-octahydro-azeto[2,1-a]isoindole-4-carboxylic acid allyl ester 2-((R)-4-(tert-Butyl-dimethyl-silanyloxy)-2-{(2S,3S)-3-[(R)-1-(tert-butyl-dimethyl-silanyloxy)-ethyl]-4-oxo-azetidin-2-yl}-butyrylsulfanylmethyl)-malonic acid diethyl ester 2-{(2S,3S)-1-Benzyl-3-[(R)-1-(tert-butyl-dimethyl-silanyloxy)-ethyl]-4-oxo-azetidin-2-yl}-2-methyl-malonic acid diallyl ester (3S,4R)-3-<(1'R)-1'-<(tert-Butyldimethylsilyl)oxy>ethyl>-4-<(1'R)-1'-(hydroxymethyl)prop-2'-enyl>azetidin-2-one {(2R,3S)-3-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-2-[2-(4-nitro-benzyloxycarbonylamino)-ethylsulfanylthiocarbonylsulfanyl]-4-oxo-azetidin-1-yl}-(triphenyl-λ5-phosphanylidene)-acetic acid 4-nitro-benzyl ester Sodium; (5R,6S)-3-(2-ethoxy-ethylsulfanyl)-6-((R)-1-hydroxy-ethyl)-7-oxo-4-thia-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylate (5R,6S)-6-<(1R)-hydroxyethyl>-2-(3-aminopropan-1-yl)-2-penem-3-carboxylic acid benzyl 7α-<(1R)-1-hydroxyethyl>-2-oxo-1-oxa-3-cephem-4-carboxylate tert-butyl 4-{[(2R,3S)-3-{(1R)-1-{[tert-butyl-(dimethyl)-silyl]-oxy}-ethyl}-4-oxoazetidin-2-yl]-acetyl}-phenyl carbamate (3S,4R)-3-((1R)-1-{[tert-butyl-(dimethyl)-silyl]-oxy}-ethyl)-4-[2-(3-{[tert-butyl-(dimethyl)-silyl]-oxy}-phenyl)-2-oxoethyl]-azetidin-2-one (3S,4R)-4-(but-3-enyl)-1-(tert-butyldimethylsilyl)-3-[(R)-1-tert-butyldimethylsilyloxyethyl]-2-azetidinone (2R,7S,8S)-9-oxo-8t-[(R)-1-hydroxyethyl]-6-acetyl-1-azatricyclo[5.2.0.02,4]nonane-2,6-dicarboxylic acid 2-allyl ester 6-ethyl ester (3S,4R)-4-(5-benzyloxypent-3-ynyl)-3-[(R)-1-tert-butyldimethylsilyloxyethyl]-2-azetidinone (2S,2aS,2bS,5aS,6R)-2-((R)-1-Hydroxy-ethyl)-2b-methyl-1,4-dioxo-octahydro-3-oxa-6a-aza-cyclobuta[a]pentalene-6-carboxylic acid benzyl ester (S)-{(2R,3S)-2-Allyl-3-[(R)-1-(tert-butyl-dimethyl-silanyloxy)-ethyl]-4-oxo-azetidin-1-yl}-hydroxy-acetic acid ethyl ester {(2R,3S)-3-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-2-[(1R,4R)-4-(2-methoxy-ethyl)-2-oxo-cyclohexyl]-4-oxo-azetidin-1-yl}-oxo-acetic acid benzyl ester (1S,6S,8aS,8bR)-1-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-6-(2-methoxy-ethyl)-2-oxo-1,2,5,6,7,8,8a,8b-octahydro-azeto[2,1-a]isoindole-4-carboxylic acid benzyl ester (5R,6S)-3-tert-Butyl-6-((R)-1-hydroxy-ethyl)-7-oxo-4-thia-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid 4-nitro-benzyl ester p-nitrobenzyl 2-<(3S,4R)-3-<(R)-1-(t-butyldimethylsilyloxy)ethyl>-4-<4-(p-nitrobenzyloxycarbonylamino)-2-oxobutyl>-2-oxo-1-azetidinyl>-2-triphenylphosphoranylideneacetate (3S,4R)-3-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-4-((S)-1-methyl-2-trityloxymethyl-allyl)-azetidin-2-one (3S,4S)-3-[(R)-1-(tert-butyldimethylsilyloxy)ethyl]-4-[1,1-di(allyloxycarbonyl)ethyl]-2-azetidinone (5R,6S)-6-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-3-(2-ethoxy-ethylsulfanyl)-7-oxo-4-thia-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid 4-nitro-benzyl ester (5R,6S)-3-(2-Ethoxy-ethylsulfanyl)-6-((R)-1-hydroxy-ethyl)-7-oxo-4-thia-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid 4-nitro-benzyl ester (5R,6S)-6-<(1R)-hydroxyethyl>-2-<(2R)-pyrrolidin-2-yl>-2-penem-3-carboxylic acid [(2R,3S)-3-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-2-((S)-1-{1-[(E)-4-nitro-benzyloxycarbonylimino]-ethyl}-pyrrolidin-3-ylsulfanylcarbonylmethyl)-4-oxo-azetidin-1-yl]-oxo-acetic acid 4-nitro-benzyl ester <3S-<3α(S*),4β>>-methyl 3-(1-t-butyldimethylsilyloxyethyl)-2-azetidinone-4-carboxylate (R)-2-{(2S,3S)-3-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-4-oxo-azetidin-2-yl}-thiopropionic acid S-(2-diethylcarbamoyl-phenyl) ester 1-{(2S,3S)-3-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-4-oxo-azetidin-2-yl}-2-oxo-cyclohex-3-enecarboxylic acid allyl ester

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