| abstract |
Disclosed are compounds of Formula A-a, or a salt thereof: Where "B 1 " and "R 1 " through "R 5 " are as defined herein, which compounds have properties for blocking Na v 1.7 ion channels found in peripheral and sympathetic neurons. Also described are pharmaceutical formulations comprising the compounds of Formula A-a or their salts, and methods of treating neuropathic pain disorders using the same. |