Shanghai Kanwinn Pharmchem Ltd. founded in 2002, mainly engaged in the development, production and trade of pharmaceutical intermediates such as gallic acid and its derivatives. we are a leading supplier specializing in providing intermediates for international chemical, pharmaceutical, fine chemical, textile and dyeing industries. Shanghai kanwinn Pharmchem Ltd. used to be a major supplier of 2,3,4-Trihydroxybenzaldehyde to Roche Group. products are sold well in Japan, the United States and Europe, with annual sales of millions of dollars. we will continuously meet the growing needs of our customers with high quality products and good service!