Psilocybin. Molecular model of the drug psilocybin (C12.H17.N2.O4.P). This psychedelic substance is present in most psychedelic mushrooms, together with psilocybin, for which it is the prodrug. The mind-altering effects of psilocybin resemble those of LSD, mescaline and DMT. Atoms are represented as spheres and are colour-coded: carbon (grey), hydrogen (white), nitrogen (blue), oxygen (red) and phosphorus (orange). Illustration.