1,2-Difenil-3,5-dicheto-4-(alpha-metil-propiliden)-pirazolidina [Italian] 26485-82-5 3,5-Pyrazolidinedione, 4-sec-butylidene-1,2-diphenyl- 4-24-00-01336 (Beilstein Handbook Reference) 4-sec-Butylidene-1,2-diphenyl-3,5-pyrazolidinedione BRN 0263662 DA-237 P.M. 306