The isolation of 6-methoxyharmalan and 6-methoxyharman from Virola cuspidata. Cassady, J. M., Blair, G. E., Raffauf, R. F., & Tyler, V. E. 1971. Lloydia, 34(1), 161–162.
"For his study, Markus mixed a representative of the β-Carbolins (harmin, harmalin, or 6-MeO-harmalan) with a tryptamine (5-MeO-DMT). He found a domain of optimal mixtures in which marked psychoactive productivity was associated with hallucinatory effects. Within certain specific ranges of dosage, the mixture was well-tolerated and there were no serious side-effects."
'A report on the symposium “On the Current State of Research in the Area of Psychoactive Substances”'. Hanscarl Leuner & Michael Schlichting [The Gateway to Inner Space: A Festschrift in Honor of Albert Hofmann. Christian Rätsch (ed.), 1989. Bridport, England: Prism Press page 237]
"For his study, Markus mixed a representative of the β-Carbolins (harmin, harmalin, or 6-MeO-harmalan) with a tryptamine (5-MeO-DMT). He found a domain of optimal mixtures in which marked psychoactive productivity was associated with hallucinatory effects. Within certain specific ranges of dosage, the mixture was well-tolerated and there were no serious side-effects."
'A report on the symposium “On the Current State of Research in the Area of Psychoactive Substances”'. Hanscarl Leuner & Michael Schlichting [The Gateway to Inner Space: A Festschrift in Honor of Albert Hofmann. Christian Rätsch (ed.), 1989. Bridport, England: Prism Press page 237]