CAS No:N/A ||Chemical Formula:C19H19N3O4S2 ||Molecular Weight:417.49800 ||Exact Mass:417.08170 ||Chemical Formula: C19H19N3O4S2|(2R,5R,6R)-3,3-dimethyl-6-(5-methyl-3-phenylisoxazole-4-carboxamido)-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carbothioic S-acid