1,2-Diphenyl-3,5-dioxopyrazolidin [German] 1,2-Diphenyl-3,5-pyrazolidinedione 2652-77-9 3,5-PYRAZOLIDINEDIONE, 1,2-DIPHENYL- 5-24-05-00186 (Beilstein Handbook Reference) BRN 0210835 DA 339 Difenildichetopirazolidina [Italian] Diphenyldiketopyrazolidine G 14744