The chemical Niraparib has a designated molecular formula of C19H20N4O and a molecular weight of 320.396 g/mol. Synonyms may include: MK 4827 (Base), UNII-HMC2H89N35, ZEJULA (ChemID). Niraparib has been assigned a MeSH pharmacological action of: Poly(ADP-ribose) Polymerase Inhibitor.