Used as a key intermediate in the synthesis of phosphodiesterase inhibitors, particularly PDE5 inhibitors, which are important in the treatment of erectile dysfunction and pulmonary arterial hypertension. It serves as a building block in the development of active pharmaceutical ingredients due to its ability to form selective, high-affinity interactions with enzyme targets. Its structure allows for functionalization at multiple sites, enabling optimization of pharmacokinetic and pharmacodynamic properties in drug design. Commonly employed in medicinal chemistry for structure-activity relationship studies aimed at improving potency and selectivity of therapeutic agents.