Potent and selective poly (ADP ribose) glycohydrolase (PARG) inhibitor (IC50 = 26 nM). Exhibits >350-fold selectivity for PARG over a panel of ion channels, enzymes and receptors, including PARP1 and ARH3. Maintains PAR chains and induces DNA double-stranded breaks in cells following DNA damage. Decreases colony formation of ZR-75-1 BRCA1 WT cells. Cell permeable. Purity 98%. MW (observed): 514.62