1-phenyl-6,7-dihydro-5H-indazol-4-one

2-(phenylhydrazinylidene)acenaphthylen-1-one

methyl 2,5-diphenyl-3,4-dihydropyrazole-3-carboxylate

2-phenylpyrazolidin-3-one

(2E)-2-(phenylhydrazinylidene)pentanedioic acid