Precursor to metabolite: Psilocybin to Psilocin

Psilocybin is converted to Psilocin by alkaline phosphatase.

The pair

Psilocybin — Serotonergic psychedelic (5-HT2A agonist) under study for depression.
Psilocin — The active dephosphorylated form of psilocybin; a 5-HT2A agonist.