6-羟基-7-甲氧基-4-甲基-2H-1-苯并吡喃-2-酮

2-甲基环戊酮

cis-2,5-dimethylcyclopentanone

(+/-)-trans-2,5-dimethylcyclopentanone

2,2,5-三甲基环戊酮