3,4-dimethyl-1-phenylpyrrole-2,5-dione

7a-methyl-6,7-dihydro-3H-2-benzofuran-1,5-dione

ethyl 2-methyl-3-oxo-5-phenylpent-4-enoate

diethyl 2-acetyl-4-heptylidene-2-methylpentanedioate

diethyl 2-acetyl-3-hexyl-2-methyl-4-methylidenepentanedioate