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(2007/10/02)cis-β,4-dioxo-3-[(phenoxyacetyl)amino]-2-azetidinepentanoic acid, (4-nitrophenyl)methyl ester
cis-α-diazo-β,4-dioxo-3-[(phenoxyacetyl)amino]-2-azetidinepentanoic acid, (4-nitrophenyl)methyl ester
cis-4-oxo-3-[(phenoxyacetyl)amino]-2-azetidinepropanoic acid
p-nitrobenzyl 7β-[(phenoxyacetyl)amino]-3-hydroxy-1-carba-1-dethia-3-cephem-4-carboxylate
1-benzyl-3β-((S)-2-oxo-4-phenyloxazolidin-3-yl)-4β-[2-(2-furyl)ethyl]azetidin-2-one