The reaction of 4-nitro-m-anisidine (I) with methanesulfonyl chloride in pyridine gives 4-nitromethanesulfony-m-anisidine (II), which is reduced with Fe and aqueous HCl yielding 4-aminomethanesulfony-m-anisidine (III) . Finally, this compound is condensed with 9-chloroacridine (IV).