Used primarily in organic synthesis as a building block for sulfur-containing compounds. Its isothiocyanate group reacts readily with amines to form thiourea derivatives, which are useful in pharmaceutical development. The methylthio and butyl chain components make it suitable for designing bioactive molecules, including potential enzyme inhibitors. It also serves in the preparation of agrochemical intermediates and functionalized polymers due to its bifunctional reactivity. Handling requires caution due to the lachrymatory and irritant nature of the isothiocyanate group.