3,5-pyrazolidinedione, 4-butyl-1,2-diphenyl- 4-butyl-1,2-diphenylpyrazolidine-3,5-dione 50-33-9 InChI=1/C19H20N2O2/c1-2-3-14-17-18(22)20(15-10-6-4-7-11-15)21(19(17)23)16-12-8-5-9-13-16/h4-13,17H,2-3,14H2,1H