1. School of Pharmacy, Jiangsu Health Vocational College, Nanjing, Jiangsu, P. R. China;
2. School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing, Jiangsu, P. R. China;
3. Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Nanjing, Jiangsu, P. R. China