5-Methoxy-7,N,N-trimethyltryptamine

5-Methoxy-7,N,N-trimethyltryptamine (5-MeO-7,N,N-TMT, 5-MeO-7-TMT), is a tryptamine derivative which acts as a partial agonist at the 5-HT₂ serotonin receptors, with an EC₅₀ of 63.9 nM and an efficacy of 66.2% at 5-HT_2A (vs 5-HT), and weaker activity at 5-HT_2B and 5-HT_2C. In animal tests, both 7,N,N-TMT and 5-MeO-7,N,N-TMT produced behavioural responses similar to those of psychedelic drugs such as DMT and 5-MeO-DMT, but compounds with larger 7-position substituents such as 7-ethyl-DMT and 7-bromo-DMT did not produce psychedelic-appropriate responding despite high 5-HT₂ receptor binding affinity, suggesting these may be antagonists or weak partial agonists for the 5-HT₂ receptors. The related compound 7-MeO-MiPT (cf. 5-MeO-MiPT) was also found to be inactive, suggesting that the 7-position has poor tolerance for bulky groups at this position, at least if agonist activity is desired.