2-methyl-4-(dimethylamino)1-4-phenyl-spiro[cyclohexane-1,8'-(5,6,8,9-tetrahydro-pyrano[3,4-b]-7-aza-indole)]
4-(azetidin-1-yl)-4-phenyl-spiro[cyclohexane-1,8'-(5,6,8,9-tetrahydropyrano[3,4-b]-7-azaindole)]
4-benzyl-4-morpholino-spiro[cyclohexane-1,8'-(5,6,8,9-tetrahydropyrano[3,4-b]-7-azaindole)]
4-(dimethylamino)-4-phenyl-spiro[cyclohexane-1,8'-(5,6,8,9-tetrahydropyrano[3,4-b]-7-azaindole)]
4-(dimethylamino)-4-(3-fluorophenyl)-spiro[cyclohexane-1,8'-(5,6,8,9-tetrahydropyrano[3,4-b]-7-azaindole)]