(6R,7R)-3-Acetyloxymethyl-7β-phenoxyacetylaminocepham-3-ene-4-carboxylic acid

(6R,7R)-3-[(Acetyloxy)methyl]-8-oxo-7-[(phenoxyacetyl)amino]-5-thia-1-azabicyclo[4.2.0]octane-2-ene-2-carboxylic acid