4-Acetoxy-N,N-dimethyltryptamine (also known as 4-AcO-DMT, 4-Acetoxy-DMT, O-Acetylpsilocin, and Psilacetin) is a widely used synthetic psychedelic substance of the tryptamine chemical class that produces an array of “classical psychedelic” effects when administered. Its effects are often compared to those produced by entheogenic tryptamines like psilocybin mushrooms and DMT. It is typically taken orally, less commonly via insufflation and rarely, via injection.
This compound has been proposed by psychedelics researcher David Nichols to be a potentially useful alternative to psilocybin for pharmacological research as they are both believed to act as prodrugs for psilocin (4-HO-DMT), the primary active component of psilocybin mushrooms. Its structural similarities to psilocin and psilocybin are thought to account for the near identical effects they produce and the three compounds are often considered to be interchangeable with each other.