In your body O-acetylpsilocin is deacetylated to psilocin by deacetylases/acetyltransferases for the duration of 1st pass metabolism[citation necessary] And through subsequent passes with the liver (evident as psilacetin can also be active through parenteral routes of ingestion). The commonest method of creation is thru acetylation of psilocin under alkaline or https://rcchemsupply.com/product/4-aco-dmt-fumarate/