endo-10,10-dimethoxytricyclo<5.2.1.02,6>dec-8-ene

环戊烯

1,4,4a,9a-tetrahydro-fluorene

2-(6,6a-dihydro-1aH-1-aza-cyclopropa[a]inden-1-yl)-isoindole-1,3-dione

cis-Bicyclo<4.3.0>nona-2,4-diene