(4,4'-BIPYRAZOLIDINE)-3,3',5,5'-TETRONE, 1,1',2,2'-TETRAPHENYL- 1,1',2,2'-Tetraphenyl-(4,4'-bipyrazolidine)-3,3',5,5'-tetrone 3474-99-5 5-26-14-00531 (Beilstein Handbook Reference) BRN 0376754 DA 381 Dipirazolidinile [Italian] Dipyraphene Dipyrazolidinyl