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

(3S,4S)-3-[(R)-1-(tert-butyldimethylsilyloxy)ethyl]-1-[[(p-nitrobenzyl)oxy]oxalyl]-4-[(R)-1-[[(R)-2-oxopyrrolidin-4-ylthio]carbonyl]ethyl]-2-azetidinone

4-nitrobenzyl 2-((3S,4S)-3-((R)-1-((tert-butyldimethylsilyl)oxy)ethyl)-2-oxo-4-((R)-1-oxo-1-(((R)-5-oxopyrrolidin-3-yl)thio)propan-2-yl)azetidin-1-yl)-2-(triethoxy-l5-phosphaneylidene)acetate

pivaloyloxymethyl (1R,5S,6S)-6-[(1R)-1-(tert-butyldimethylsilyloxy)ethyl]-2-[(3S,5S)-5-(N,N-dimethylcarbamoyl)-1-(isobutyryloxymethyloxycarbonyl)pyrrolidin-3-ylthio]-1-methylcarbapen-2-em-3-carboxylate

(1R,5R,6S)-2-<4'-(aminomethyl)phenyl>-6-<(1R)-1-hydroxyethyl>-1-methylcarbapen-2-em-3-carboxylic acid

杂氮双环磷酸酯

(4R,5S,6S)-4-Methyl-7-oxo-3-((R)-5-oxo-1-triethylsilanyl-pyrrolidin-3-ylsulfanyl)-6-((R)-1-trimethylsilanyloxy-ethyl)-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid 2,2-dimethyl-propionyloxymethyl ester

(3S,4S)-4-[(R)-1-[[(R)-2-oxo-1-(triethylsilyl)pyrrolidin-4-ylthio]carbonyl]ethyl]-1-[[(pivaloyloxy)methyloxy]oxalyl]-3-[(R)-1-(trimethylsilyloxy)ethyl]-2-azetidinone

4-nitrobenzyl 2-((3S,4S)-3-((R)-1-((tert-butyldimethylsilyl)oxy)ethyl)-2-oxo-4-((R)-1-oxo-1-(((R)-5-oxopyrrolidin-3-yl)thio)propan-2-yl)azetidin-1-yl)-2-(diethoxy(ethyl)-l5-phosphaneylidene)acetate

(3S,4S)-3-<(tert-butyldimethylsiloxy)methyl>-4-<1(R)-(methoxycarbonyl)ethyl>azetidin-2-one

(R)-2-[(2S,3S)-4-Oxo-3-((R)-1-triethylsilanyloxy-ethyl)-azetidin-2-yl]-thiopropionic acid S-((R)-5-oxo-1-triethylsilanyl-pyrrolidin-3-yl) ester

[(3S,4S)-3-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-2-oxo-4-((R)-1-phenylsulfanylcarbonyl-ethyl)-azetidin-1-yl]-acetic acid allyl ester

potassium (1R,5R,6S)-2-(3'-pyridyl)-6-<(1R)-1-hydroxyethyl>-1-methylcarbapen-2-em-3-carboxylate

(3S,4S)-3-[(R)-1-[[(R)-2-oxopyrrolidin-4-ylthio]carbonyl]ethyl]-3-[(R)-1-(triethylsilyloxy)ethyl]-2-azetidinone

(R)-2-[(2S,3S)-3-((S)-1-Hydroxy-ethyl)-4-oxo-azetidin-2-yl]-propionic acid benzyl ester

potassium (1R,5R,6S)-2-<4'-(hydroxymethyl)phenyl>-6-<(1R)-1-hydroxyethyl>-1-methylcarbapen-2-em-3-carboxylate

(2S,5R,6S,7S)-7-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-5-methyl-4,8-dioxo-3-thia-1-aza-bicyclo[4.2.0]octane-2-carboxylic acid 2,2-dimethyl-propionyloxymethyl ester

(3S,4S)-3-[(R)-1-[[(R)-2-oxopyrrolidin-4-ylthio]carbonyl]ethyl]-3-[(R)-1-(trimethylsilyloxy)ethyl]-2-azetidinone

(4S,5R,6S)-6-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-3-[1,3]dithian-2-ylidene-4-methyl-7-oxo-1-aza-bicyclo[3.2.0]heptane-2-carboxylic acid benzhydryl ester