1. H.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences; University of Karachi; Karachi; 75270; Pakistan
2. Department of Biological and Biomedical Sciences; The Aga Khan University; Karachi; 74800; Pakistan
3. Division of Pharmacognosy, Phytochemistry and Narcotics; National Institute of Health Sciences, 1-18-1, Kamiyoga; Setagaya-ku; Tokyo; 158-8501; Japan