(R)-3-hydroxymethyl-2-((1R)-7-oxo-3-phenyl-(1rH,5cH)-4-oxa-2,6-diaza-bicyclo[3.2.0]hept-2-en-6-yl)-but-3-enoic acid benzhydryl ester

(2R)-3-甲基-2-[(1R,5S)-3-苯基-7-氧代-4-氧杂-2,6-二氮杂双环[3,2,0]庚-2-烯-6-基]-3-丁烯酸二苯甲酯

(R)-3-chloromethyl-2-((1R)-7-oxo-3-phenyl-(1rH,5cH)-4-oxa-2,6-diaza-bicyclo[3.2.0]hept-2-en-6-yl)-but-3-enoic acid benzhydryl ester

Diphenylmethyl-2-(3R,4R-3-benzamido-4-chlor-2-oxo-azetidin-1-yl)-3-chlormethyl-3-butenoat

6-epipenicillin sulfoxide