. "6-{[3-(2-Chloro-phenyl)-5-methyl-isoxazole-4-carbonyl]-amino}-3,3-dimethyl-7-oxo-4-thia-1-aza-bicyclo[3.2.0]heptane-2-carboxylic acid anion(Cloxacillin)" . "12 (cloxacillin)" . . . .