Synonyms: 4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylicacid, 3,3-dimethyl-7-oxo-6-(2-phenoxyacetamido)-, p-nitrobenzyl ester, 4-oxide(8CI); 4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid,3,3-dimethyl-7-oxo-6-[(phenoxyacetyl)amino]-, (4-nitrophenyl)methyl ester,4-oxide, [2S-(2a,5a,6b)]-; Benzyl alcohol, p-nitro-,3,3-dimethyl-7-oxo-6-(2-phenoxyacetamido)-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylate(ester) S-oxide (8CI); 4-Nitrobenzyl 6-(phenoxyacetamido)penicillanate 1-oxide;Penicillin V sulfoxide p-nitrobenzyl ester; Phenoxymethylpenicillin sulfoxide4-nitrobenzyl ester; p-Nitrobenzyl 6-phenoxyacetamidopenicillanate sulfoxide;p-Nitrobenzyl penicillin V S-oxide