Syonyms Name: Penicillin V sulfoxide; (2S-(2alpha,5alpha,6beta))-3,3-Dimethyl-7-oxo-6-(phenoxyacetamido)-4-thia-1-azabicyclo(3.2.0)heptane-2-carboxylic acid 4-oxide; (2S,5R,6R)-3,3-dimethyl-7-oxo-6-[(phenoxyacetyl)amino]-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic a