Used as a key intermediate in the synthesis of phosphodiesterase (PDE) inhibitors, particularly PDE5 inhibitors, which are important in the treatment of erectile dysfunction and pulmonary arterial hypertension. Its structure serves as a scaffold for building bioactive molecules that modulate enzyme activity. Commonly employed in medicinal chemistry for developing analogs with enhanced selectivity and potency. Also utilized in research settings to explore structure-activity relationships in heterocyclic compounds targeting central nervous system disorders and inflammation.