6-meo-thh 6-meo-thh 6-meo-thh, or 6-methoxy-1,2,3,4-tetrahydroharman, is a β-carboline (or more specifically a pinoline) derivative and a structural isomer of tetrahydroharmine (7-meo-thh). 6-meo-thh is mentioned in alexander shulgin's book tihkal (tryptamines i have known and loved), stating that 6-meo-thh is very similar to the other carbolines. limited testing suggests that it possesses mild psychoactive effects at 1.5 mg/kg and is said to be about one-third as potent as 6-methoxyharmalan. it has been isolated from certain plants of the virola family. 6-meo-thhidentifiers iupac name 6-methoxy-1-methyl-2,3,4,9-tetrahydro-1h-pyridoindole cas number1210-56-6 npubchem cid71028chemspider64188 yuniiu18p8j9o2ichemblchembl221811 ycomptox dashboard (epa)dtxsid20871835 chemical and physical dataformulac13h16n2omolar mass216.284 g·mol−13d model (jsmol)interactive imagemelting point152–155 °c (306–311 °f) smiles cc1nccc2=c1nc(c=c3)=c2c=c3oc inchi inchi=1s/c13h16n2o/c1-8-13-10(5-6-14-8)11-7-9(16-2)3-4-12(11)15-13/h3-4,7-8,14-15h,5-6h2,1-2h3 ykey:rduorfdqrfhybf-uhfffaoysa-n y ny (what is this?) (verify) pharmacology very little is known about the psychoactivity of 6-meo-thh in humans. studies in rats have shown it to bind to a number of serotonin 5-ht1 receptors and 5-ht2 receptors, dopamine d2 receptors, benzodiazepine receptors, and imidazoline receptors.