Metanilic acid (also known as meta amino benzene sulphonic acid) is an isomer of sulfanilic acid with the sulfonic acid. Sulphonic acids form diazo compounds readily and are used for making dyes, as a combustion standard in pauly reaction and in the quantitative analysis of nitrate and nitrite ions. Quantity Provided: 250 ml/Bottle Molecular Weight: 173.17 Molecular Formula: C6H7NO3S CAS No: 121-47-1 Assay: Min. 97%