3-acetoxymethyl-7-methoxy-1-aza-5-thia-8-oxo-bicyclo(4.2.0)oct-2-ene-2-carboxypyrrolidine carboxamide
3-acetoxymethyl-7-methoxy-1-aza-5-thia-8-oxo-bicyclo(4.2.0)oct-2-ene-2-carboxypyrrolidine carboxamide