A hybrid molecule patterned after arachidonoyl serotonin; while saturated 11- or 12-fatty acids linked to serotonin potently inhibit capsaicin-induced TRPV1 channel activation (IC50 =0.76 μM) without blocking FAAH-mediated hydrolysis of arachidonoyl ethanolamine (IC50 > 50 μM), the effects of stearoyl serotonin are unknown.