4-(3-Oxobutyl)-1,2-diphenyl-3,5-pyrazolidinedione; 1,2-Diphenyl-4-(2-acetylethyl)pyrazolidine-3,5-dione; Chebutan; Chepirol; Chetazol; Chetazolidin; Chetil; Chetopir; Copirene; Ejor; Gammachetone; KPB; Ketanol; Ketason; Ketazon; Ketazone; Ketophenylbutazone; Pecnon; Phloguron; Recheton; Reuchetal; γ-Ketazone; γ-Ketophenylbutazone; γ-Oxophenylbutazone