N 1833 (OTTO) 5-Nitroisophthalic acid, 98% Cas 618-88-2 - used as an intermediate of medicine compound and as a disperser in dyes. N 1833 (OTTO) 5-Nitroisophthalic acid, 98% Cas 618-88-2 - used as an intermediate in organic synthesis, agrochemical,pharmaceutical and dyestuffs etc,.