Synonyms: 3,5-Pyrazolidinedione,4-(3-methyl-2-butenyl)-1,2-diphenyl- (8CI,9CI);4-(2-Isopentenyl)-1,2-diphenyl-3,5-pyrazolidinedione;4-(3-Methyl-2-butenyl)-1,2-diphenyl-3,5-pyrazolidinedione;4-Prenyl-1,2-diphenyl-3,5-dioxopyrazolidine;4-Prenyl-1,2-diphenyl-3,5-pyrazolidinedione;Analud;DA 2370;Fenilprenazone;Feprazone;Methrazone;Metrazone;Phenylprenazone;Pheprazone;Prenazone;Zepelin;