2,3,6,7-Tetrahydro-1

9-Julolidinecarboxaldehyde

2,3,3a,4,5,6-Hexahydro-3a-aza-1H-phenalene-8-carbaldehyde

1,2,3,4,5,6-Hexahydro-3a-aza-3aH-phenalene-8-carbaldehyde

2,3,6,7-Tetrahydro-1H,5H-benzo[ij]quinolizine-9-carbaldehyde

1,2,3,5,6,7-Hexahydropyrido[3,2,1-ij]quinoline-9-carbaldehyde