1. Bioactivity Programme, Natural Products Division, Forest Research Institute Malaysia (FRIM), Kepong 52109, Selangor, Malaysia
2. Organic Synthesis Laboratory, Institute of Science, Universiti Teknologi MARA (UiTM), Puncak Alam Campus, Puncak Alam, Kuala Selangor 42300, Selangor, Malaysia
3. Pharmacy Programme, Sultan Azlan Shah Allied Health Sciences College, Tanjung Rambutan 31250, Perak, Malaysia
4. Faculty of Applied Sciences, Universiti Teknologi MARA (UiTM), Shah Alam 40450, Selangor, Malaysia