S 3563 (OTTO) 3-Sulphobenzoic acid monosodium salt, 97% Cas 17625-03-5 - used in the synthesis of ionic liquid, 1-hexyl-3-propanenitrileimidazolium sulfobenzoate (SBA). S 3563 (OTTO) 3-Sulphobenzoic acid monosodium salt, 97% Cas 17625-03-5 - used in the preparation of 4,4′-(ethene-1,2-diyl)dipyridinium bis(3-carboxybenzenesulfonate).