Beijing Chemsun PharmTech Co., Ltd, located in Beijing Fengtai Science Park, is a competitive player in the global specialty 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.CHEMSUN also performs custom synthesis, contract manufacturing and toll manufacturing providing the bulk active ingredients and advanced intermediates.CHEMSUN� s advantages are:Access to skillful and creative chemistsMost comprehensive chemistry literatures and search engines in ChinaExperience in varieties of reactionsEasy communications & in-time responseCompetitive costsThe main reactions we are skilled in are below:Chlorination, bromination, fluorination, sulfonation, chlorosulfonation, diazotation, nitration, reduction, oxidation, esterification, etherification, elimination, cyclization, condensation, amination, amidation, hydrolysis, hydrogenation etc.Beijing Chemsun Pharmtech Co., Ltd. is a very strong in the synthesis of all kinds of sulfonyl chlorides and sulfonamides, especially those very difficult to synthesize. CHEMSUN: supply sulfonyl chlorides, pyrazines, custom manufacturing.