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Taicang Hengyi Medicine Chemical Material Factory & Hengfei Pharmaceutical Co., Ltd. Established in 1999, Taicang Hengyi occupies an area of about 20,000 square meters to the north of Taicang City, Jiangsu province. With its strong points in chemical and pharmaceutical intermediates, Hengyi has become to be one of the main suppliers in Tricyclic Antidepressants(TCA) in China.