– AZD5305 is a potent, selective and oral active PARP inhibitor. AZD5305 is a highly potent inhibitor of PARP1, with significant PARP1-DNA trapping activity, no PARP2-activity, nor binding activity to any other members of the PARP family. AZD5305 has excellent secondary pharmacology and physicochemical properties as well as high oral bioavailability in preclinical species.