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25B-NBOH (also called 2C-B-NBOH or NBOH-2C-B) is a derivative of the phenethylamine-derived hallucinogen 2C-B which has been sold as a designer drug. It acts as a potent serotonin receptor agonist with similar affinity to the better known compound 25B-NBOMe at 5-HT2A and 5-HT2C receptors with pKis values of 8.3 and 9.4 respectively. It is worth noting that compounds of the NBOMe class are not orally active and should therefore be taken sublingually by simply placing the substance into one's mouth and allowing it to slowly absorb over a period of 30 minutes.
25B-NBOH is illegal in Sweden as of January 26, 2016