α,N,N-Trimethyltryptamine (α,N,N-TMT, α-TMT, ATMT) is a psychoactive drug of the tryptamine chemical class which acts as a psychedelic hallucinogen.

It is similar in structure to the other psychedelics of the tryptamine class such as dimethyltryptamine (DMT) and α-methyltryptamine (α-MT).

α-TMT has been tested in animals in comparison with α-MT and was found to produce similar effects, but with only around half the potency.

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