Methyl 5-(Acetylamino)-2-hydroxybenzoate is an intermediate useful in the synthesis of 5-Amino-3-(4-sulfonylphenyl)salicyclic Acid Sodium Salt (A629340), which is an impurity of mesalamine (M258100), which is the active metabolite of Sulfasalazine (S699084). Anti-inflammatory (gastrointestinal).