1. Dept of Chemistry, Fac of Science and Technology, Universitas Airlangga, Komplek Kampus C UNAIR, Jl. Mulyorejo, Surabaya, Indonesia
2. Department of Chemistry, Mandalar Degree College, Mandalay, Myanmar
3. Department of Chemistry, Mandalay University, Myanmar
4. Faculty of Pharmacy, Meijo University, Yagotoyama, Tempaku, Nagoya, Japan