(7R)-3-(Acetyloxymethyl)-7-[(2-thienylacetyl)amino]cepham-3-ene-4-carboxylic acid 4-chlorophenacyl ester

2-(p-chlorophenyl)-2-oxoethyl (6R-trans)-3-(acetoxymethyl)-8-oxo-7-(2-thienylacetamido)-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate

(6R,7R)-3-[(Acetyloxy)methyl]-8-oxo-7α-[(2-thienylacetyl)amino]-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid 2-(4-chlorophenyl)-2-oxoethyl ester