we are the Tsinghua University - Chengzhishareholding - Chengzhi Life Science Co., Ltd. It was established in 2000, had produced D- ribose for 10 years, is now the world's largest supplier of D- ribose. It has become an innovative transnational enterprise with the full intellectual property rights of D-ribose product manufacturing and application. In addition to D- ribose, alpha arbutin, L- glutamine are supplied too. Thirty-two domestic or international patent, which covering various aspects of production and application of D- ribose, alpha arbutin, L- glutamine and other products belong to us.