N,N'-diphenylhydrazide-5-methyl-4-hexenoic acid
N,N'-diphenylhydrazide-2-carboxy-5-methyl-4-hexenoic acid
N,N'-diphenylhydrazide-2-carboxy-2-hydroxy-5-methyl-4-hexenoic acid
4-hydroxy feprazone
E-1,2-diphenyl-3,5-dioxo-4-(3'-hydroxymethyl-but-2'-enyl)pyrazolidine