1. Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Surabaya, Surabaya, Indonesia
2. Center of Natural Products Medicine Research and Development, Institute of Tropical Disease, Universitas Airlangga, Surabaya, Indonesia
3. Natural Products Chemistry Research Group, Organic Chemistry Division, Department of Chemistry, Faculty of Science and Technology, Universitas Airlangga, Surabaya, Indonesia