1. Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, University Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
2. Department of Plant Science, Faculty of Agriculture, University Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
3. Laboratory of Natural Products, Institute of Bioscience, University Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia