1. State Key Laboratory of Natural and Biomimetic Drugs, Chemical Biology Center School of Pharmaceutical Sciences Peking University Xue Yuan Road No. 38 Beijing 100191 China
2. NuChem Sciences Inc. 2350 rue Cohen Suite 201 Saint-Laurent Quebec H4R 2N6 Canada
3. State Key Laboratory of Medicinal Chemical Biology Nankai University 38 Tongyan Rd Tianjin 300350 China