5-(hydroxymethyl)-2,3-dimethylcyclopent-2-en-1-one

2,3-二甲基-2-环戊烯酮

2,3-dimethylbut-2-enal

4,5-Dimethyl-hex-4-en-1-yn-3-ol

ethyl 3,4-dimethyl-2-oxo-1-((phenylsulfonyl)methyl)cyclopent-3-ene-1-carboxylate