Synonyms: 4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylicacid, 3,3-dimethyl-7-oxo-6-(2-phenoxybutyramido)- (6CI,8CI);4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid,3,3-dimethyl-7-oxo-6-[(1-oxo-2-phenoxybutyl)amino]-, [2S-(2a,5a,6b)]-;(1-Phenoxypropyl)penicillin; 3,3-Dimethyl-7-oxo-6-(2-phenoxybutyramido)-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylicacid;Penicillin, (1-phenoxypropyl)-;Phenoxypropylpenicillin;Propicillin;Synthepen P;a-Phenoxybutyryl-6-aminopenicillanicacid;a-Phenoxypropylpenicillin