Synonyms: 4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylicacid, 3,3-dimethyl-6-(5-methyl-3-phenyl-4-isoxazolecarboxamido)-7-oxo- (8CI);4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid,3,3-dimethyl-6-[[(5-methyl-3-phenyl-4-isoxazolyl)carbonyl]amino]-7-oxo-, [2S-(2a,5a,6b)]-; 5-Methyl-3-phenyl-4-isooxazolylpenicillin;5-Methyl-3-phenyl-4-isoxazolylpenicillin;6-(5-Methyl-3-phenyl-4-isoxazolyl)aminopenicillanic acid; MPI-penicillin;MPi-PC; Oxacillin; Oxazocillin; Oxazocilline; Penicillin,(5-methyl-3-phenyl-4-isoxazolyl)-; Prostaphlyn