1-Benzylpiperazine (also known as N-benzylpiperazine) is a heterocyclic compound typically used as a RSM in the preparation of Olaparib (AZD-2281, KU-59436) ,a small molecule inhibitor of the nuclear enzyme poly (ADP-ribose) polymerase (PARP) with potential chemosensitizing, radiosensitizing, and antineoplastic activities.
4-[3-(4-cyclopropanecarbonylpiperazine-1-carbonyl)-4-fluorobenzyl]-2H-phthalazin-1-one: A novel bioavailable inhibitor of Poly(ADP-ribose) polymerase-1. 
Role of PARP inhibitors in cancer biology and therapy. Current Medicinal Chemistry. 
 K.A.Menear, et al, J. Med. Chem., 2008, 51(20), pp 6581-6591.