3',5-dimethyl-3,5'-dioxo-1',2-diphenyl-1',2,3,5'-tetrahydro-[4,4'-bipyrazolylidene] 1-oxide; 1',2,3,5'-Tetrahydro-[4,4'-bipyrazolylidene] 1-Oxide, (Z)-3',5-Dimethyl-3,5'-dioxo-1',2-diphenyl-
3',5-dimethyl-3,5'-dioxo-1',2-diphenyl-1',2,3,5'-tetrahydro-[4,4'-bipyrazolylidene] 1-oxide; 1',2,3,5'-Tetrahydro-[4,4'-bipyrazolylidene] 1-Oxide, (Z)-3',5-Dimethyl-3,5'-dioxo-1',2-diphenyl-