1,2-Difenil-3,5-dicheto-4-(alpha-metil-etiliden)-pirazolidina [Italian] 1,2-Diphenyl-4-isopropylidene-3,5-pyrazolidinedione 26485-81-4 3,5-Pyrazolidinedione, 1,2-diphenyl-4-isopropylidene- 5-24-07-00240 (Beilstein Handbook Reference) BRN 0241834 DA-236 NSC 68647 P.M. 292