7-Chloro-6-sulfamoylisatoic Anhydride is an intermediate in the synthesis of 2-Amino-4-chloro-5-sulfamoyl-o-benzotoluidide (A604420) and in the synthesis of 3-Aryl- and 3-​aralkyl-​1,​2,​3,​4-​tetrahydro-​4-​oxo-​6-​quinazolinesulfonamides.