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Psilocin (also known as 4-HO-DMT, 4-hydroxy DMT, psilocine, psilocyn, or psilotsin) is a substituted tryptamine alkaloid and a serotonergic psychedelic substance. It is present in most psychedelic mushrooms together with its phosphorylated counterpart psilocybin.

Other names: 4-hydroxy-N,N-dimethyltryptamine

Elimination half-life: 1-3 hours

Molar mass: 204.27 g/mol g·mol⁻¹