Synonyms: 4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylicacid, 3,3-dimethyl-7-oxo-6-(2-phenoxybutyramido)-, L- (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(R*)]]-; L-Propicillin; Levopropicillin; Levopropylcillin