1. Natural Products Research Division, Department of Biological and Biomedical Sciences; Aga Khan University; PO Box 3500, Stadium Road Karachi 74800 Sindh Pakistan
2. Internal Medicine Section, Department of Medicine; Hamad Medical Corporation; PO Box 3050 Doha Qatar
3. Pakistan Council for Science and Technology; G-5/2 Islamabad Pakistan
4. H.E.J. Research Institute of Chemistry, International Centre for Chemical and Biological Sciences; University of Karachi; Karachi Sindh 75270 Pakistan