Used as a key intermediate in the synthesis of pharmaceutical compounds, particularly in the development of kinase inhibitors and antimicrobial agents. Its hydrazine and bromo functional groups allow for selective derivatization, enabling the construction of complex heterocyclic systems found in bioactive molecules. Commonly employed in medicinal chemistry for scaffold modification and structure-activity relationship studies. Also utilized in the preparation of dyes and functional materials due to its electron-rich pyrimidine core and sulfur-containing substituent.