1. Department of Chemistry; University of Mosul; Al-Majmo‘a St. 41002 Mosul Iraq
2. Chemistry Department; University of Malaya; 50603 Kuala Lumpur Malaysia
3. Chemistry Division, Center for Foundation Studies in Science; University of Malaya; 50603 Kuala Lumpur Malaysia
4. Key Laboratory of Plant Resources Conservation and Sustainable Utilization / Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden; Chinese Academy of Sciences; Xingke Road 723, Tianhe District Guangzhou 510650, People's Republic of China