Used as a key intermediate in the synthesis of pharmaceuticals, particularly in the development of antihypertensive drugs. It serves as a building block for active pharmaceutical ingredients (APIs) due to its reactive functional groups and heterocyclic structure. Commonly employed in medicinal chemistry for structure-activity relationship (SAR) studies, especially in optimizing drug candidates targeting cardiovascular diseases. Also utilized in agrochemical research for the design of novel pesticides and herbicides, where the pyrazine core contributes to bioactivity and stability. Its ester and chloro functionalities allow for easy modification through nucleophilic substitution and ester hydrolysis, enabling diverse derivatization in synthetic pathways.