Xi'an Guanyu Bio-tech Co., Ltd is located in Xi'an city, Shaanxi province, China, which is specializes in research, development, production and trade of API (active pharmaceutical ingredient). Guanyu Bio-tech has 100 staff members with various expertise among whom there are 50 phytochemistry and medicine synthesis technicians.     Guanyu Bio-tech mainly undertakes researching, developing and producing in fields of Anti-cancer pharmaceutical raw materials, intermediates and herb extracts such as Irinotecan, Paclitaxel, Docetaxel, Resveratrol, Homoharringtonine, Etoposide, Topotecan, Camptothecin, 7-ethyl-10-Hydroxycamptothecin, and Vinorelbine. The products have been exported to USA, Europe , Asia, Africa, South America, Australia and so on.     We also supply contract or customer-made research development on natural products either as raw material or for end use. Our powerful R& D team will satisfy you with low cost and good efficiency.    If the above products be of interest to you, please don't hesitate to contact us for details.