(4,4'-Bi-2-pyrazoline)-5,5'-dione, 3,3'-dimethyl-1,1'-diphenyl- (4,4'-Bi-3H-pyrazole)-3,3'-dione, 2,2',4,4'-tetrahydro-5,5'-dimethyl-2,2'-diphenyl- 3,3'-Dimethyl-1,1'-diphenyl-4,4'-bi-5-pyrazolone 7477-67-0 EINECS 231-282-5 NSC 37393 NSC 401001