Snoutene

Pentacyclo[4.4.0.02,4.03,8.05,7]deca-9-ene

Octahydro-1,2-ethenodicyclopropa[cd,gh]pentalene

2,2a,2b,3,5a,5b-Hexahydro-1,2,3-metheno-1H-cycloprop[cd]indene

2,2a,2b,3,5a,5b-Hexahydro-1,2,3-metheno-1H-cyclopropa[cd]indene