As one of leading manufacturer of pentaerythritol (CAS:115-77-5), Sulfanilic Acid (CAS:121-57-3) and Levulinic Acid (levulinate) (CAS:123-76-2) in China. Also be strong on items of Optical Brightener Series, Fluorescent Pigment Series and Vat Dyes. Please feel free to contact us to know more.Email: pharmacn at yahoo.com