1. Centre for Advanced Drug Research; department of Pharmacy; COMSATS Institute of Information Technology; Abbottabad- 22060 Pakistan
2. Department of Life Sciences and Chemistry; Jacobs University; P.O. Box 750561 28725 Bremen Germany
3. Department of Chemistry, Q; uaid-i-Azam University; 45320- Islamabad Pakistan
4. Dr. K. C. Patel Research and Development Centre; Charotar University of Science and Technology (CHARUSAT), Dist. Anand; 388421 Gujarat India