Profile: Beijing Chemsun Pharmtech Co., Ltd. is a manufacturer of fluorine organic chemicals, chiral intermediates and heterocyclic chemicals. Our sulfonyl chloride derivatives include p-nitrobenzenesulfonyl chloride, 3-methylbenzenesulfonyl chloride, 2,4-dibromobenzenesulfonyl chloride, 2,3-dichlorobenzenesulfonyl chloride, 3-chlorobenzenesulfonyl chloride and 2-fluorobenzenesulfonyl chloride. Our heterocyclic derivatives include 4-bromoindazole, 2,5-dibromopyrazine, 2-amino-5-bromopyrazine, 1,4-benzodioxane and 3-nitrodibenzofuran.