Used primarily as a chemical intermediate in organic synthesis, particularly in the preparation of dyes, pharmaceuticals, and agrochemicals. Its sulfonyl chloride group readily reacts with amines to form sulfonamides, which are key structural motifs in many biologically active compounds. It also serves as a derivatizing agent in analytical chemistry for the detection and quantification of amine-containing substances. Due to the electron-withdrawing nitro group and the methyl substituent, it offers selective reactivity useful in multi-step synthesis where controlled functionalization is required.