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Chemical Name: Optical Brightening Agent CBS-X Synonyms: Optical brightner CBS-X; 4,4'-bis(2-disulfonic acid styryl) biphenyl; Disodium 4,4'-bis(2-sulfostyryl)biphenyl; Fluorescent Brightener 351; Optical Brightener 351 CAS No.: 27344-41-8 / 54351-85-8 Molecular Formula: C28H20Na2O6S2 Appearance: Yellowish green crystal powder/ granular Purity: 98%min