(+/-)-5-chloro-5-methyl-2-cyclopentenone

carbon monoxide

4-methyl-1-(trimethylsilyl)penta-1,4-dien-3-one

4-甲氧基-5-甲基-4-环戊烯-1,3-二酮

2-methyl-5-(phenylsulfinyl)cyclopentan-1-one