Chloroisatin is a chemical intermediate that usually appears in the form of a yellowish-red crystal. Comprised of eight carbon, four hydrogen, one chlorine, one nitrogen, and two oxygen atoms, the substance exhibits a molecular weight of 181.5. One of several different isatins currently available, chloroisatin is a versatile substrate that can be utilized to synthesize a wide range of heterocyclic compounds, such as quinolines and indoles. The chemical intermediate also frequently finds use as a raw material for pharmaceutical synthesis and has been recently involved in efforts to create new anticonvulsant drugs.