N,N'-Di-n-butylurea is primarily used as an intermediate in the synthesis of various chemical compounds. It plays a significant role in the production of pharmaceuticals, where it is utilized to create active ingredients or modify drug molecules to enhance their efficacy or stability. Additionally, it is employed in the manufacture of agrochemicals, contributing to the development of pesticides and herbicides that improve crop protection. In industrial applications, it serves as a precursor in the production of specialty chemicals, including polymers and resins, where it helps in achieving desired material properties. Its versatility in chemical reactions makes it valuable in research and development for creating novel compounds with specific functionalities.