Beijing ChemSun PharmTech Co., Ltd, located in Beijing Fengtai Science Park, is a competitive player in the global specialty and fine chemical market. Focusing on developing the innovative technologies for organic synthesis, CHEMSUN has both the expertise and flexibility to produce a wide range of chemicals, such as active pharmaceutical intermediates, fluorine organic chemicals, chiral intermediates, and heterocyclic chemicals. Main products: Darifenacin, Rufinamide, Pazopanib, Vilazodone, Eltrombopag, Dronedarone, pyrazine series, sulfonyl chlorides.