1,4-环己二酮单乙二醇缩酮

N-甲基二苯胺

1,4-环己二酮双乙二醇二缩酮

ethyl 8-methyl-1,4-dioxaspiro[4.5]dec-7-ene-7-carboxylate

ethyl 2-methyl-5-oxocyclohexene-1-carboxylate