5-Amino-2-(methylthio)pyrimidine is primarily utilized in the field of organic synthesis and pharmaceutical research. It serves as a key intermediate in the production of various biologically active compounds, particularly those with potential therapeutic applications. This chemical is often employed in the development of antiviral and anticancer agents due to its pyrimidine core, which is a common structural motif in many drugs. Additionally, it is used in the synthesis of agrochemicals, contributing to the creation of pesticides and herbicides that help protect crops from pests and diseases. Its versatility in chemical reactions makes it a valuable building block in the design and optimization of new molecules for both medical and agricultural purposes.