(+)-(3As,6as)-3a,6a-二氢-2,2-二甲基-4H-环戊并-1,3-二氧代-4-酮

6-oxabicyclo[3.1.0]hexan-3-one

1-methoxycyclopenta-1,3-diene

2-methoxycyclopenta-1,3-diene