Wiktionary
muscimol
n. (context biochemistry English) A hallucinogenic alkaloid present in the fly agaric and other related fungi; 3-hydroxy-5-aminomethylisoxazole. (from 20th c.)
Wikipedia
Muscimol
Muscimol (also known as agarin or pantherine) is the principal psychoactive constituent of Amanita muscaria and related species of mushroom. Muscimol acts as a potent, selective agonist for the GABA receptors and displays sedative-hypnotic and dissociative psychoactivity.