乙酸酐

1alpha,6beta,7beta,9alpha-四羟基-8,13-环氧-赖百当-14-烯-11-酮

2,2-二甲基戊二酸二甲酯

4,4-dimethyl-5-(tetrahydro-2H-pyran-2-yloxy)pentanal

2,2-dimethyl-4-(3-methyl-5-oxo-2,5-dihydrofuran-2-yl)butanal