Used in the synthesis of pharmaceutical intermediates, particularly in the development of vasodilator drugs like bosentan for treating pulmonary arterial hypertension. Acts as a key building block in organic synthesis due to reactive anhydride group, enabling formation of amides and esters. Employed in the preparation of specialty polymers and functional materials where methoxy groups enhance solubility and reactivity. Also utilized in research settings for constructing complex heterocyclic systems in medicinal chemistry.