1. Faculty of Resource Science and Technology, Universiti Malaysia Sarawak, Kota Samarahan, Malaysia
2. Research Group of Solid State Chemistry and Catalysis, Chemistry Department, Faculty of Mathematics and Natural Sciences, Sebelas Maret University, Surakarta, Indonesia
3. Drug and Herbal Centre, Faculty of Pharmacy, Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia
4. Department of Pharmacy, Faculty of Health Science, Alma Ata University, Yogyakarta, Indonesia