BACE1-IN-5 (Compound 15), a potent β-site amyloid precursor protein cleaving enzyme 1 (BACE1) inhibitor, demonstrates significant efficacy with an IC50 of 9.1 nM for BACE1 inhibition and an impressive IC50 of 0.82 nM against cellular amyloid-β (Aβ) production. Additionally, it is engineered to enhance hERG inhibition and P-gp efflux, indicating its optimized medicinal chemistry profile [1].