1-Fenyl-3,5-dioxo-4-(3-chlorkrotyl)pyrazolidin [Czech] 25809-71-6 3,5-Pyrazolidinedione, 4-(3-chloro-2-butenyl)-1-phenyl- 4-(3-Chloro-2-butenyl)-1-phenyl-3,5-pyrazolidinedione 5-24-07-00268 (Beilstein Handbook Reference) BRN 0802858