3a,6a-二甲基四氢环丁烷并[1,2-c:3,4-c']二呋喃-1,3,4,6-四酮

3a,6a-二甲基四氢环丁烷并[1,2-c:3,4-c']二呋喃-1,3,4,6-四酮

3a,6a-Dimethyltetrahydrocyclobuta[1,2-c:3,4-c']difuran-1,3,4,6-tetraone