Used in pharmaceutical research as a key intermediate in the synthesis of targeted cancer therapies, particularly in the development of PARP (poly ADP-ribose polymerase) inhibitors. Its structure supports binding to specific enzyme active sites, enhancing selectivity and potency. The ethynyl group allows for further functionalization via click chemistry, making it valuable in medicinal chemistry for rapid compound optimization. Also explored in the design of covalent inhibitors due to its potential for forming stable interactions with biological targets.