Psilocin

Psilocin (4-OH-DMT), an aromatic compound, sometimes also spelled psilocine, psilocyn, or psilotsin, is a psychedelic mushroom alkaloid. It is found in most psychedelic mushrooms together with its phosphorylated counterpart psilocybin. Psilocin is a Schedule I drug under the Convention on Psychotropic Substances. The mind-altering effects of psilocin are highly variable and subjective, but resemble those caused by LSD and mescaline. The effects typically last anywhere from three to eight hours depending on certain variables (such as metabolism, food interaction); however the effects can seem to last much longer due to psilocin's ability to distort the perception of time.

Read more about Psilocin:  Chemistry, Pharmacology, Behavioral and Non-behavioral Effects