QX-222 (chloride)

[1]A Sunami, et al. A critical residue for isoform difference in tetrodotoxin affinity is a molecular determinant of the external access path for local anesthetics in the cardiac sodium channel. Proc Natl Acad Sci U S A. 2000 Feb 29;97 (5) :2326-31.|[2]Qingmin Chen, et al. Differential blockade of nerve injury-induced thermal and tactile hypersensitivity by systemically administered brain-penetrating and peripherally restricted local anesthetics. J Pain. 2004 Jun;5 (5) :281-9.|[3]J A Flatman, et al. Reversibility of Ia EPSP investigated with intracellularly iontophoresed QX-222. J Neurophysiol. 1982 Aug;48 (2) :419-30.