The Meixner test is known to result in a color chane, reported as reddish-brown for 5-substituted tryptamines and gray to pale blue for 4-substituted tryptamines. The substituted 4-hydroxytryptamine compound psilocin is found in many genera of mushroom, including Psilocybe, Panaeolus, and Conocybe. Substituted 5-hydroxytryptamine compounds found in mushrooms include serotonin (5-hydroxytryptamine), present in Panaeolus ( up to 0.5%), and 5-hydroxy-N,N-dimethyltryptamine (bufotenine), present at up to 7.5 mg/g in some Amanita species. The Figure demonstrates the structures of the substituted tryptamines used in this experiment; the cyclopeptide is omitted from the amanitin structure(it bonds at R1 and R2).