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(2007/10/02)(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
epi-Secopenicillin
Diphenylmethyl-2-(3R,4R-3-benzamido-4-chlor-2-oxo-azetidin-1-yl)-3-chlormethyl-3-butenoat
6-epipenicillin sulfoxide
(S)-3-Hydroxymethyl-2-((1S,5R)-7-oxo-3-phenyl-4-oxa-2,6-diaza-bicyclo[3.2.0]hept-2-en-6-yl)-but-3-enoic acid benzhydryl ester
Diphenylmethyl-2-(1R,5S-3-phenyl-7-oxo-4-oxa-2,6-diazabicyclo<3.2.0>hept-2-en-6-yl)-3,4-dihydroxy-3-(1N-Methyltetrazol)thiomethylbutyrat
(R)-3-(1-Methyl-1H-tetrazol-5-ylsulfanylmethyl)-2-((1R,5S)-7-oxo-3-phenyl-4-oxa-2,6-diaza-bicyclo[3.2.0]hept-2-en-6-yl)-but-3-enoic acid benzhydryl ester
(R)-3-Acetoxymethyl-2-((1R,5S)-7-oxo-3-phenyl-4-oxa-2,6-diaza-bicyclo[3.2.0]hept-2-en-6-yl)-but-3-enoic acid benzhydryl ester