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Systematic (IUPAC) name
3-[2-(methylammonio)ethyl]-1H-indol-4-yl hydrogen phosphate
Clinical data
Routes of
Legal status
Legal status
CAS Number 21420-58-6
ATC code none
PubChem CID 161359
ChemSpider 141741
Chemical data
Formula C11H15N2O4P
Molar mass 270.222 g/mol[[Script error: No such module "String".]]
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Baeocystin is a mushroom alkaloid and analog of the psychedelic hallucinogenic drug psilocybin, a tryptamine derivative. It is found as a minor compound in most psychoactive mushrooms together with psilocybin, norbaeocystin, and psilocin. Little information exists with regard to human pharmacology, but in Magic Mushrooms Around the World, Jochen Gartz reports being aware of a study in which "10 mg of baeocystin were found to be about as psychoactive as a similar amount of psilocybin."

First isolated from the mushroom Psilocybe baeocystis,[1] and later from P. semilanceata (Repke & Leslie 1977) and first synthesized by Troxler et al. (1959) Baeocystin is a demethylated derivative of psilocybin.


  1. Leung, A.Y. and A.G. Paul. "Baeocystin and Norbaeocystin: New Analogs of Psilocybin from Psilocybe baeocystis." Journal of Pharmaceutical Sciences 57(10): 1667-1671 (1968).
  • DB Repke, DT Leslie, G Guzman. "Baeocystin in Psilocybe, Conocybe and Panaeolus." Lloydia. 1977 Nov-Dec;40(6):566-78.

fr:Baeocystine pl:Baeocystyna fi:Baeokystiini sv:Baeocystin