Psilocin
Naturally occurring psychedelic compound found in certain species of mushrooms, commonly referred to as 'magic mushrooms.' It is chemically similar to serotonin, a neurotransmitter in the brain, and acts primarily by stimulating serotonin receptors, leading to altered perception, mood changes, and visual hallucinations. Psilocin is used in both recreational and therapeutic contexts, with its legal status varying by country.