WLB-89462 (Compound 20c) is a selective σ2 receptor ligand with a K i of 13 nM, demonstrating neuroprotective properties and the capacity to ameliorate Aβ peptide-induced short-term memory impairment in rats. It exhibits a favorable ADMET profile, featuring good solubility, lack of CYP inhibition, strong metabolic stability, high permeability, effective brain penetration, and significant oral exposure in rodent models [1].