penicillin G sulphoxide, 6-(2-phenylacetamido)penicillanic acid-1-oxide, [2S-(2alpha,5alpha,6beta)]-3,3-dimethyl-7-oxo-6-(phenylacetamido)-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4-oxide, [2S-(2,5,6)]-3,3-DIMETHYL-7-OXO-6-(PHENYLACETAMIDO)-4-THIA-1-AZABICYCLO[3.2.0]HEPTANE-2-CARBOXYLIC ACID 4-OXIDE, penicillin V sulfoxide, (2S,5R,6R)-3,3-Dimethyl-4,7-dioxo-6-phenylacetylamino-4λ4-thia-1-aza-bicyclo[3.2.0]heptane-2-carboxylic acid, [2S-(2α,5α,6β)]-3,3-dimethyl-7-oxo-6-(phenylacetamido)-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4-oxide, penicillin G sulfoxide, 1ξ-oxo-6β-(2-phenyl-acetylamino)-1λ4-penicillanic acid, 1ξ-Oxo-6β-(2-phenyl-acetylamino)-1λ4-penicillansaeure