Olaparib-d4-1 (AZD2281-d4-1) is the deuterium labeled Olaparib (HY-10162). Olaparib is a potent and orally active PARP inhibitor with IC50s of 5 and 1 nM for PARP1 and PARP2, respectively. Olaparib is an autophagy and mitophagy activator[1][2][3][4].