1. Natural Products Chemistry Research Group, Organic Chemistry Division, Department of Chemistry, Faculty of Science and Technology, Universitas Airlangga, Surabaya, Indonesia
2. Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Surabaya, Surabaya, Indonesia
3. Natural Products Chemistry Research Group, Organic Chemistry Division, Bandung Institute of Technology, Bandung, Indonesia
4. Faculty of Applied Sciences, Universiti Teknologi MARA, Shah Alam, Selangor, Malaysia