A small library of FAAH and dual FAAH/MAGL inhibitors designed for peripheral selectivity were targeted. Of these compounds, three were identified to have desirable FAAH inhibition and reduced permeability in a PAMPA assay. Those three compounds were advanced into a MAGL inhibitor assay and one was found to be a relative selective FAAH inhibitor, FAAH to MAGL IC ratio of 1:27, and one was found to be more characteristic of a true dual enzyme inhibitor, FAAH to MAGL IC ratio of 1:4. Both compounds showed activity in an ABPP assay, blockage of TAMRA-FP labeling of FAAH and MAGL in rat eye homogenate.
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