1,2-Diphenyl-4-(3-chloro-2-butenyl)-3,5-pyrazolidinedione 10561-01-0 3,5-Pyrazolidinedione, 4-(3-chloro-2-butenyl)-1,2-diphenyl- 4-(gamma-Chloro)-crotyl-1,2-diphenyl-3,5-pyrazolidinedione 4-24-00-01336 (Beilstein Handbook Reference) BRN 0036611 CKP [German] Chlorkrotylpyrazolidin [German]