– AGB1 is a fast, highly selective, and potent bump-and-hole (B&H)-PROTAC degrader for BromoTag. AGB1 exhibits degradation for Ab:Brd4BD2 L387A and Ab: BromoTag-Brd2 with pDC50s of 7.8 and 7.9. AGB1 exhibits binary affinity to VHL (Kd=125 nM). AGB1 exhibits favorable pharmacokinetic profile in mice with the DC50, 6 h of ?13 nM.