Biochem/physiol Actions Regioisomer 1-5 of LY2183240 is a potent inhibitor of anandamide uptake (IC50= 15 nM). The compound inhibits FAAH (IC50=2.1 nM) and some other brain serine proteases. After systemic administration to rodents, LY2182340 elevates brain anandamide levels and shows efficacy in a rodent model of persistent pain (ED50=1.37 mg/kg). Regioisomer 2-5 of LY2183240 is less active. The compound is more potent than N-(4-Hydroxyphenyl)-arachidonylamide (AM-404), which inhibits anandamide transport at IC50=1mM.