7-Methoxytryptamine is an indole substance. The 7-methoxytryptamine moiety can be found in a number of alkaloids, first of all in Aspidosperma type alkaloids (among others as aspidospermine, beninine, dichotamine, kopsingine, 12-methoxyvoaphylline, vobtusine), but it can be also in many other type alkaloids as crenatidine, cuanzine, vincaricine, vinervinine, and others[1][2].
[1] Nauzer P. Dubash, Naveen K. Mangu, Apparao Satyam. (2004) Synthesis of 7-Alkoxy/Hydroxy-α-methyltryptamines. Synthetic Communications 34:10, pages 1791-1799.