p. 2507 - 2517
(1975)diazomethane
3-deacetyloxy-7-aminocephalosporanic acid
benzoyl chloride
(6R)-7t-benzoylamino-3-methyl-8-oxo-(6rH)-5-thia-1-aza-bicyclo[4.2.0]oct-3-ene-2c-carboxylic acid methyl ester
2-[acetyl-(5-oxo-2-phenyl-oxazol-4-ylidenemethyl)-amino]-3-methoxythiocarbonyl-but-2-enoic acid methyl ester
7t-benzoylamino-4c-methoxy-3-methyl-5t,8-dioxo-(6rH)-5λ4-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid methyl ester
(Z)-2-(4-benzoylamino-3-oxo-3H-isothiazol-2-yl)-4-ethoxy-4-methoxy-3-methyl-but-2-enoic acid methyl ester
(Z)-2-(4-benzoylamino-3-oxo-3H-isothiazol-2-yl)-3-methyl-4-oxo-but-2-enoic acid methyl ester