1. Faculty of Traditional Thai Medicine; Prince of Songkla University; Hat Yai Songkhla 90112 Thailand
2. Institute of Botany; Jiangsu Province and Chinese Academy of Sciences; Nanjing Botanical Garden, Mem Sun Yat-Sen, No 1 Qianhuhoucun, P.O. Box 1435 Nanjing 210014 P. R. China
3. School of Pharmacy; Jiangsu University; Zhenjiang 202013 P. R. China
4. Dongtai Institute of Tidal Flat; Nanjing Branch of Chinese Academy of Sciences; Dongtai 224200 P. R. China