Neuronal nicotinic receptor antagonist that displays selectivity for the α9α10 subtype (IC50 values are 19, 140, 980, 4200 and 7300 nM for α9α10, α6/α3β2β3, α6/α3β4, α3β4 and α3β2 subtypes respectively). Alleviates neuropathic pain in three rat models of human neuropathic pain and accelerates functional recovery of injured neurons.