Methylchlorophenyl isoxazolyl penicillin sodium
4-Thia-1-azabicyclo(3.2.0)heptane-2-carboxylic Acid, 6-(3-(2-chlorophenyl)-5-methyl-4-isoxazolecarboxamido)-3,3-dimethyl-7-oxo-, Monosodium Salt,(2S,5R,6R)-