2-(hydroxyamino)-4-(nitrosomethyl)cyclopenta-2,4-dien-1-one

2-溴-3-甲基-2-环戊烯-1-酮

3,5-二甲基环戊-2-烯-1-酮

3-ethenyl-3-methylcyclopentan-1-one

2-(8-methyl-1,4-dioxaspiro[4.4]nonan-8-yl)ethanol