Drawn to the potential for improved selectivity and safety profiles of PARP-1-specific inhibitors over their first-generation counterparts, Merck KGaA signed an exclusive, worldwide license deal with Jiangsu Hengrui Pharmaceuticals Co. Ltd. worth up to €1.4 billion (US$1.5 billion) to gain access to the latter’s next-generation poly (ADP-ribose) polymerase (PARP)-1 inhibitor, HRS-1167.