(1Z)-7-bromo-1-pyrrolidin-2-ylidene-2H-pyrido[3,4-b]indol-6-one

7-bromo-6-methoxy-1-(1-pyrrolin-2-yl)-β-carboline

6-bromo-5-methoxy-Nb-(1-BOC-prolyl)tryptamine

6-bromo-5-methoxy-Nb-methoxycarbonyltryptamine

methyl (2-(1-acetyl-6-bromo-5-methoxy-1H-indol-3-yl)ethyl)carbamate