Department of Anatomy, Physiology and Biochemistry, Swedish University of Agricultural Sciences, P.0. Box 7070, Uppsala, Sweden;
Natural Product Research Center, Faculty of Science, Prince of Songkla University, Hat Yai, Songkla, Thailand-90112;
Department of Biochemistry, School of Biological Sciences, Sri Venkateshwara University, Tirupati, A.P., India;
Department of Biochemistry, School of Biological Sciences, Sri Venkateshwara University, Tirupati, A.P., India;