Panxin pharmaceutical &chemical Co., Ltd. is a large-scale high tech chemical enterprise which is specialized in manufacturing Crotonic acid, Ethyl crotonate, Trans-Methyl crotonate, Crotonyl alcohol, Crotonitrile, 1-Chlorobut-2-ene, Pyridinium chlorochromate, Cinnamonitrile, Furazolidone, DL-Serine, D-Serine, Quinoxaline, Pyrazine-2, 3-dicarboxylic acid, 4-Chloro-3, 5-dimethylphenol, Serinol and Lauroyl L-Carnitine Chloride