1. College of Material Science and Engineering; Central South University of Forestry and Technology; Changsha 410004 P. R. China
2. State Key Laboratory of Drug Research; Shanghai Institute of Materia Medica; Chinese Academy of Sciences; 555 Zu Chong Zhi Road Zhang Jiang Hi-Tech park Shanghai 201203 P. R. China
3. Institute of Biomolecular Chemistry (ICB)-CNR; Via Campi Flegrei, 34 IT-80078 Pozzuoli Naples
4. Jiangsu Kanion Pharmaceutical Co., Ltd.; Lianyungang 222001 P. R. China