1,4-dihydro-6,7-dimethoxy-1,4-methanonaphthalene

dimethyl 2,3-diazabicyclo[2.2.1]hept-5-ene-2,3-dicarboxylate

2-(cyclopenten-1-yl)ethynylbenzene

3-[(E)-α-Chlorbenzyliden]-spiro[bicyclo[2.2.1]hept-5-en-2,1'-cyclopentan]

3-(2-methylpropoxy)cyclopent-2-en-1-one