FHATHBIN, also known as 5-hydroxy-11-aminotetrahydrobenzindole or as 4,α-methylene-5-HT, is a serotonin receptor agonist of the partial ergoline group. It is a cyclized tryptamine and tricyclic derivative of serotonin (5-hydroxytryptamine) as well as a simplified analogue of LSD. The drug is known to act on the serotonin 5-HT1A receptor. FHATHBIN was first reported in the scientific literature by 1984.

See also Partial ergoline RU-27849 Bay R 1531 (LY-197206) FAEFHI Diaza-2C-DFLY O-Methylnordehydrobufotenine 2C-B-5-hemiFLY-α6

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