methyl 7-(2-methyl-1-<2H>isoquinolinonyl-4-carboxamido)-3-methylceph-3-eme-4-carboxylate

(R)-7-[1-Methoxy-eth-(E)-ylideneamino]-3-methyl-8-oxo-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid benzhydryl ester

(6R)-7t-amino-3,7c-dimethyl-8-oxo-(6rH)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid tert-butyl ester

(6R)-7t-((R)-2-amino-2-phenyl-acetylamino)-3,7c-dimethyl-8-oxo-(6rH)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid

(6R,6'R)-7t,7't'-bis-benzoylamino-3,3'-dimethyl-5t,8,5't',8'-tetraoxo-4c,4'c'-propane-1,3-diylbissulfanyl-bis-((6rH)-5λ4-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid) dimethyl ester