Niraparib (MK-4827) is a PARP inhibitor that selectively inhibits PARP1 and PARP2 (IC50=3.8/2.1 nM). Niraparib has antitumor activity, inhibits DNA damage repair, and induces apoptosis.

MK-4827 Racemate (Niraparib Racemate) is a selective PARP1 and PARP2 inhibitor with IC50s of 3.8 nM and 2.1 nM, respectively, over 330-fold selectivity for PARP3, V-PARP and Tank1.

Niraparib R-enantiomer (MK 4827 R-enantiomer) is an inhibitor of PARP1(IC50 of 2.4 nM).

Niraparib hydrochloride (MK-4827 hydrochloride) is an inhibitor of poly (ADP-ribose) polymerase (PARP) with potential antineoplastic activity. Niraparib hydrochloride inhibits PARP activity, enhancing the accumulation of DNA strand breaks and promoting genomic instability and apoptosis. The PARP family of proteins detect and repair single-strand DNA breaks by the base-excision repair (BER) pathway.

Niraparib tosylate (MK-4827 (tosylate))(with IC50 of 3.8 nM/2.1 nM) is a selective PARP1/PARP2 inhibitor.

Niraparib, also know as MK-4827, is an inhibitor of poly (ADP-ribose) polymerase (PARP) with potential antineoplastic activity. MK4827 inhibits PARP activity, enhancing the accumulation of DNA strand breaks and promoting genomic instability and apoptosis. The PARP family of proteins detect and repair single strand DNA breaks by the base-excision repair (BER) pathway.