1,3-dimethyl-6-phenylpyrrolo[3,2-d]pyrimidine-2,4(1H,3H)-dione

dimethyl 2-phenacylidenepropanedioate

2-cyclohexylidene-1-phenylethanone

methyl 4-oxo-4-phenylbut-2-ynoate

benzoyl β-2-furyl-γ-oxo-2-furanilidene