25B-NBOMe (
NBOMe-2C-B,
Cimbi-36,
Nova,
BOM 2-CB) is a derivative of the
phenethylamine psychedelic 2C-B, discovered in 2004 by Ralf Heim at the
Free University of Berlin. It acts as a potent
partial agonist for the
5HT2A receptor. Anecdotal reports from users suggest 25B-NBOMe to be an active hallucinogen at a dose of as little as 250–500 µg, making it a similar potency to other phenethylamine derived hallucinogens such as
bromo-dragonfly. Duration of effects lasts about 12–16 hours.