25C-NBOMe (NBOMe-2C-C, 2C-C-NBOMe, Cimbi-82) is a psychedelic drug and derivative of the psychedelic phenethylamine 2C-C. 25C-NBOMe appeared on online vendor sites in 2010 but was not reported in the literature until 2011. It acts as a potent partial agonist for the 5HT_2A receptor, and has been studied in its ¹¹C radiolabelled form as a potential ligand for mapping the distribution of 5-HT_2A receptors in the brain, using positron emission tomography (PET).