1. Biochemistry Department, College of Medicine and Health Science, Sultan Qaboos University, Muscat, Oman;
2. Natural and Medical Sciences Research Center, University of Nizwa, Nizwa, Sultanate of Oman;
3. Organic Chemistry, Martin-Luther-University Halle-Wittenberg, Halle (Saale), Germany;
4. Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, Halle, Germany