1. Natural and Medical Sciences Research Center (NMSRC); University of Nizwa; 616 Nizwa Sultanate of Oman
2. Department of Chemistry; College of Science; Sultan Qaboos University; PO Box 36, Al-Khod 123 Muscat Sultanate of Oman
3. Organic Chemistry, Kurt-Mothes-str. 2; College of Science; Martin-Luther-University Halle-Wittenberg; 06120 Halle Saale Germany