Used as an intermediate in the synthesis of biologically active compounds, particularly in pharmaceuticals targeting central nervous system disorders. Its sulfonyl chloride group readily reacts with amines to form sulfonamides, which are common motifs in drug design. It is also employed in the preparation of selective enzyme inhibitors and receptor modulators due to the stability and favorable pharmacokinetic properties imparted by the acetylindoline scaffold. Commonly utilized in medicinal chemistry research for building novel compounds with potential antidepressant, antipsychotic, or anti-inflammatory activity.