We are one of India's leading manufacturers, exporters & suppliers of Ortho Toluidine 5 Sulfonic Acid (OTS). Its chemical name is 2-Aminotoluene-5-sulfonic acid. The CAS Number of Ortho Toluidine 5 Sulfonic Acid (OTS) is 98-33-9 and its chemical formula is C7H9SO3N. The most common end use is Dyes and its various other synonyms are OTS;2-Amino-5-sulfotoluene;2-Methyl-4-sulfoaniline;3-methylsulphanilic acid;2-TOLUIDINE-5-SULFONIC ACID;o-Toluidine-4-sulfonic acid;o-Toluidine-4-sulfphonicacid;4-AMINO-M-TOLUENESULFONIC ACID;2-AMINOTOLUENE-5-SULFONIC ACID;6-AMINOTOLUENE-3-SULFONIC ACID .