Used as a key intermediate in the synthesis of pharmaceutical agents, particularly in the development of antiviral and antibacterial drugs. Its structure supports the formation of biologically active compounds by serving as a building block in heterocyclic chemistry. Commonly employed in medicinal chemistry for structure-activity relationship (SAR) studies due to the reactivity of the amine group and the electron-deficient pyrazine ring. Also utilized in the preparation of kinase inhibitors and other targeted therapies in oncology research. Its chloro and amino functionalities allow for selective modifications, enabling the creation of diverse compound libraries for drug discovery.