(6R,7R)-7-amino-3-(chloromethyl)-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxyli acid diphenylmethyl ester hydrochloride
phenylacetyl chloride
3-[1-2-(2-methyl-5-oxoisoxazolidin-3-yl)vinyl]-7-(2-phenylacetamido)-3-cephem-4-carboxylate
3-[1-2-(3,3-dicholoroxiran-2-yl)vinyl]-7-(2-phenylacetamido)-3-cephem-4-carboxylic acid
7-(phenylacetamido)-3-vinylcephem-4-carboxylic acid
diphenylmethyl 7β-phenylacetamido-3-vinyl-3-cephem-4-carboxylate
(6R,7R)-7-amino-3-vinyl-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid