2,5-降冰片二烯

N-ethoxycarbonyl-(2,3,4,5-tetrachloro-1-thiophenio)amide

4,5,6,7-tetrachloro-11,12-diazatetracyclo[8,2,2,12,913,8]tetradeca-4,6,11-triene

endo-cis-1,6,7,8-Tetrachlor-9,9-dimethoxy-Δ3,7-tricyclo(4.2.1.02,5)nonadien