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. Author manuscript; available in PMC: 2011 Jun 11.
Published in final edited form as: Pain Pract. 2010 Mar 2;10(3):185–200. doi: 10.1111/j.1533-2500.2010.00358.x

Figure 1.

Figure 1

Chemical structure of capsaicin (top) and resiniferatoxin (RTX) (bottom) illustrating common active moieties including –methoxy and hydroxyl groups (circled). Although both function as agonists at the TRPV1 receptor, RTX has higher potency and a characteristically slow but persistent activation.