23284-14-2 4-Thia-1-azabicyclo(3.2.0)heptane-2-carboxylic acid, 3,3-dimethyl-6-(5-methyl-3-phenyl-4-isoxazolecarboxamido)-7-oxo-, compd. with viomycin (3:1) Viomycin 3-phenyl-5-methyl-4-isoxazolylpenicillinate Viomycin, tris(3,3-dimethyl-6-(5-methyl-3-phenyl-4-isoxazolecarboxamido)-7-oxo-4-thia-1-azabicyclo(3.2.0)heptane-2-carboxylate) (salt)