Synonyms: [2S-(2alpha,4beta,5alpha,6beta)]-3,3-dimethyl-7-oxo-6-(phenylacetamido)-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4-oxide;(2S-(2alpha,4beta,5alpha,6beta))-3,3-Dimethyl-7-oxo-6-(phenylacetamido)-4-thia-1-azabicyclo(3.2.0)heptane-2-carboxylic acid 4-oxide;Einecs 251-828-6