双环戊二烯

7,7-二氯二环[3.2.0]庚-2-烯-6-酮

dimethyl 1,4a,7,7a-tetrahydro-1,3-dimethyl-8-phenyl-1,4-ethano-4H-2-pyridine-4,9-dicarboxylate

2,3,3,5,6-Pentachloro-4-azatricyclo[5.2.1.02,6]deca-4,8-diene

spiro[tricyclo[5.2.1.02,6]deca-3,8-dien-5,1'-cyclopropane]