diethyl 3-acetyl-4-methylcyclohex-3-ene-1,1-dicarboxylate

diethyl 2-[(2,4-dichloroanilino)methylidene]propanedioate

3,3-dimethyl-5-oxohexanoic acid

2H-吡啶并[1,2-a]嘧啶-2,4(3H)-二酮

5-戊基环己烷-1,3-二酮