2-甲基-4-羰基-2-环己烯-1-羧酸乙酯

2-(3-oxobutyl)isoindole-1,3-dione

2,3,6-trimethylcyclohex-2-en-1-one

3-ethyl-4-methyl-cyclohex-2-enone

2-环己烯-1-酮