NAAA-IN-2 (Compound 9), a potent and selective inhibitor of NAAA, exhibits an IC50 of 50 nM. NAAA, a cysteine amidase, primarily breaks down the endogenous biolipids palmitoylethanolamide (PEA) and oleoylethanolamide (OEA). This compound demonstrates promise for inflammation and pain research [1].