(4,4'-BI-3-PYRAZOLINE)-5,5'-DIONE, 1,1'-DIPHENYL-2,2',3,3'-TETRAMETHYL- (4,4'-Bi-1H-pyrazole)-3,3'-dione, 2,2',3,3'-tetrahydro-1,1',5,5'-tetramethyl-2,2'-diphenyl- (9CI) (4,4'-Bi-3-pyrazoline)-5,5'-dione, 2,2',3,3'-tetramethyl-1,1'-diphenyl- (8CI) 2,2',3,3'-Tetramethyl-1,1'-diphenyl(4,4'-bi-3-pyrazoline)-5,5'-dione 4-26-00-02474 (Beilstein Handbook Reference) 517-83-9 BRN 0351034 Forbisen NSC 14060 S. N. 475 SN 475