α2C-adrenoceptor antagonist that displays ~ 50-fold selectivity over other α2-adrenoceptor subtypes (Ki values are 28, 1470, 1700 and 3150 nM for human α2C, α2B, α2D and α2A subtypes respectively). Potently antagonizes adrenalin-stimulated 35GTPγS binding in vitro (KB = 16 nM) and produces antidepressant and antipsychotic-like effects in vivo. Purity 99%. MW (observed): 441.4