1,2,4-Triphenyl-3,5-dioxopyrazolidine 1,2,4-Triphenyl-3,5-pyrazolidinedione 26485-72-3 3,5-Pyrazolidinedione, 1,2,4-triphenyl- 5-24-08-00004 (Beilstein Handbook Reference) BRN 0288782