How is 4-Amino-3-methylbenzenesulfonic acid (CAS: 98-33-9) typically synthesized?

4-Amino-3-methylbenzenesulfonic acid (CAS: 98-33-9) can be synthesized through a series of reactions. Commonly, it is synthesized by first preparing 3-methylbenzenesulfonic acid and then converting it to its corresponding sulfonamide. This process involves the use of amines and sulfonic acid groups, with careful control of reaction conditions to achieve the desired product. The exact methods may vary, but they typically involve aromatic substitution and amide formation reactions.