A PROTAC-based androgen receptor (AR) degrader is a bifunctional small molecule, consisting of an AR ligand that binds to AR protein, and a ligand that binds to and recruits an E3 ligase complex, tethered together through a linker. Researchers report the discovery of exceptionally potent and orally bioavailable PROTAC AR degrader ARD-2585 (Compound 43). ARD-2585 is a promising AR degrader for extensive investigations for the treatment of advanced prostate cancer. The liver microsomal stability assay was performed by Medicilon. The plasma stability assay was performed by Medicilon. The hERG assay was performed by Medicilon.