3,3,6,6-tetramethyl-9-phenyl-3,4,5,6,7,9-hexahydro-1H-xanthene-1,8-(2H)-dione

5,5-二甲基-1,3-环己二酮

3,6,6-三甲基-1,5,6,7-四氢-4H-吲唑-4-酮

3-氯-5,5-二甲基-2-环己烯-1-酮

2,6,6-trimethyl-4-oxo-4,5,6,7-tetrahydrobenzofuran-3-carboxylic acid