4-HO-McPT (4-hydroxy-N-methyl-N-cyclopropyltryptamine) is a synthetic indole alkaloid molecule of the tryptamine class. It is a derivative of the neurotransmitter serotonin (5-HT), specifically a substituted methylated version of the compound. 4-HO-McPT is a potent agonist at both 5-HT2A and 5-HT2C serotonin receptors, with a Ki of 1.7 nM and 2.6 nM, respectively. As a result, it is speculated to produce psychedelic effects similar to those of LSD, although there is no evidence currently to support this claim.
4-HO-McPT is not currently listed as a controlled substance in any country, but its structural similarity to other hallucinogenic tryptamines such as DMT and 5-MeO-DMT means that it could potentially be added to controlled substance lists in the future.


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