Table 1.

Structure of tetrahydro-β-carboline compounds.

Compound	R1	R2
1	methyl	-H
2	phenyl	-H
3	-H	-H
4	trichloromethyl	-H
5	3-methoxy-4-hydroxyphenyl	-H
6	methyl	methyl
7	phenyl	methyl
8	3-methoxy-4-hydroxyphenyl	methyl
9	trichloromethyl	methyl
10	-H	methyl