PF 3845 hydrate is a potent, irreversible FAAH inhibitor
PF 3845 is a potent, irreversible inhibitor of fatty acid amide hydrolase (FAAH), the principle enzyme involved in the degradation of the endocannabinoid anandamide. The endocannabinoid system is a target for therapeutic pain relief. PF-3845 is a covalent inhibitor that carbamylates FAAH′s serine nucleophile. It high selectivity over other enzymes including FAAH-2. In mouse studies, PF-3845 has been shown to raise brain anandamide levels for up to 24 hr; and in a rat model it produced significant reduction of inflammatory pain..