1-(3,4-Dichlorophenyl)-3-methylurea, commonly known as monolinuron, is a selective herbicide used in agriculture to control broadleaf weeds in crops such as corn and soybeans. It functions by inhibiting photosynthesis in target plants, causing weeds to wilt and die within a few days of application. This compound is often formulated in mixtures with other herbicides to improve efficacy and exhibits moderate soil persistence, enabling extended weed control for several weeks. Additionally, it serves as an intermediate in the synthesis of pharmaceuticals and agrochemicals, and in research for developing urea-based compounds with biological activity, including enzyme inhibitors for pest control and medicinal chemistry.