4-Aminobenzenesulfonic acid; Aniline-4-sulfonic acid; p-Anilinesulfonic acid; Sulfanilic acid; Kyselina Sulfanilova (Czech); Sulfanilsaeure (German); Aniline-p-sulfonic acid; 4-Sulfanilic acid; Aniline-4-sulfonic acid CAS NO: 121-57-3