Synonyms: | 4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylicacid, 3,3-dimethyl-7-oxo-6-(pyrazinecarboxamido)- (8CI);4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid,3,3-dimethyl-7-oxo-6-[(pyrazinylcarbonyl)amino]-, [2S-(2a,5a,6b)]-; Penicillin, pyrazinyl- |