BSI-201 is a PARP1 inhibitor with demonstrated effectiveness in triple-negative breast cancer (TNBC).

PJ34 HCl is a potent specific inhibitor of PARP-l/2 with IC50 of 110 nM and 86 nM.

INO-1001 is an isoindolinone derivative and potent inhibitor of the nuclear enzyme poly (ADP-ribose) polymerase (PARP) with chemosensitization and radiosensitization properties. INO-1001 inhibits PARP, which may result in inhibition of tumor cell DNA repair mechanisms and, so, tumor cell resistance to chemotherapy and radiation therapy. PARP enzymes are activated by DNA breaks and have been implicated in the repair of DNA single-strand breaks (SSB). NOTE: as of 7/29/2016, many vendors are selling INO-1001 with wrong structure (3-aminobenzamide, CAS# 3544-24-9)

Benzamide, an inhibitor of poly (ADP-ribose) polymerase, is a derivative of benzoic acid.

Veliparib 2HCl is a potent inhibitor of PARP1 and PARP2 with Ki of 5.2 nM and 2.9 nM, respectively.