[6R-[3(Z),6α,7β]]-3-[2-(4-Methyl-5-thiazolyl)ethenyl]-8-oxo-7-[(phenylacetyl)amino]-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic Acid Diphenylmethyl Ester; (6R,7R)-7-Phenylacetamido-3-[(1Z)-2-(4-methyl-5-thiazolyl)ethenyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic Acid Diphenyl Methyl Ester;

Intermediate in the preparation of Cephalosporin antibiotics and derivatives.