Synonyms: 4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylicacid, 6-(2,2-dimethyl-5-oxo-4-phenyl-1-imidazolidinyl)-3,3-dimethyl-7-oxo-,D-(-)- (8CI); 4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid,6-(2,2-dimethyl-5-oxo-4-phenyl-1-imidazolidinyl)-3,3-dimethyl-7-oxo-, [2S-[2a,5a,6b(S*)]]-; BL-P 804; BRL 804; Etacillin; Hetacillin; Penplenum;Phenazacillin; Versapen; Versatrex; Vimocilin