5,8-dimethyl-2,3,4,9-tetrahydro-1H-carbazole

2-phenylmethoxycyclohexan-1-one

2-丁基环己酮

5,12-二氢吲哚并[3,2-a]咔唑

6-甲基-2,3,4,9-四氢-1H-咔唑