Used as a key intermediate in the synthesis of pharmaceuticals, particularly in the development of antiviral and anticancer agents. Its hydrazine and pyrimidine functionalities allow for versatile chemical modifications, making it valuable in constructing nitrogen-containing heterocycles. Commonly employed in the preparation of kinase inhibitors and other bioactive molecules where the chloro and hydrazino groups can be selectively displaced or cyclized. Also utilized in agrochemical research for designing novel pesticides and herbicides due to its ability to interact with biological targets in pests and pathogens.