1. Department of Chemistry and Center for Innovation in Chemistry Faculty of Science Burapha University, Longhaad Bangsaen Rd. Chonburi 20131 Thailand
2. The Research Unit in Synthetic Compounds and Synthetic Analogues from Natural Product for Drug Discovery (RSND) Burapha University Longhaad Bangsaen Rd. Chonburi 20131 Thailand
3. Department of Physiology, Faculty of Science Mahidol University Bangkok 10400 Thailand