1. Department of Chemistry, Faculty of Science and Technology, Universitas Airlangga, Komplek Kampus C UNAIR, Jl, Mulyorejo, Surabaya, Indonesia;
2. Department of Chemistry, Kyaukse University, Kyaukse Township, Myanmar;
3. Center of Excellence in Natural Products, Department of Chemistry, Faculty of Science, Chulalongkorn University, Thailand;
4. Faculty of Pharmacy, Meijo University, Tempaku, Nagoya, Japan