Niraparib R-enantiomer (MK-4827 R-enantiomer) is an excellentPARP1inhibitor withIC₅₀of 2.4 nM.

Niraparib R-enantiomer (MK-4827 R-enantiomer) resolution of Niraparib R-enantiomer give compounds Niraparib R-enantiomer and Niraparib S-enantiomer, both showing excellent inhibition of PARP-1. Niraparib R-enantiomer has somewhat lower in vitro metabolic clearance than the Niraparib S-enantiomer in rat liver microsomes, but Niraparib S-enantiomer is more potent in cell based assays (PARylation EC₅₀, Niraparib R-enantiomer=30 nM, Niraparib S-enantiomer=4.0 nM; BRCA1-HeLa CC₅₀, Niraparib R-enantiomer=470, Niraparib S-enantiomer=34 nM). Given this improved potency and similar in vitro turnover in human liver microsomes (HLM Cl_int, Niraparib R-enantiomer=4, Niraparib S-enantiomer=3 μL/min/mgP), Niraparib S-enantiomer (Niraparib) is focused on^[1].

320.39

Solid

C₁₉H₂₀N₄O

1038915-58-0

Room temperature in continental US; may vary elsewhere.

DMSO : ≥ 32 mg/mL(99.88 mM)

*"≥" means soluble, but saturation unknown.

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