B 1390 (OTTO) Benzenesulphonic acid sodium salt, 97% Cas 515-42-4 - used in Raman spectroscopic determination of molecular structural features in sulfonated polystyrene resins. B 1390 (OTTO) Benzenesulphonic acid sodium salt, 97% Cas 515-42-4 - used as electrolyte in formation of polypyrrole coatings with varying surface morphology on stainless steel. B 1390 (OTTO) Benzenesulphonic acid sodium salt, 97% Cas 515-42-4 - used in the synthesis of 1-butyl-3-propanenitrile imidazolium benzenesulfonate.