1. Laboratory of Organic Synthesis, Chulabhorn Research Institute, 54 Kamphaeng Phet 6 Road, Talat Bang Khen, Lak Si, Bangkok 10210, Thailand
2. Laboratory of Medicinal Chemistry, Chulabhorn Research Institute, 54 Kamphaeng Phet 6 Road, Talat Bang Khen, Lak Si, Bangkok 10210, Thailand
3. Program in Chemical Sciences, Chulabhorn Graduate Institute, 54 Kamphaeng Phet 6 Road, Talat Bang Khen, Lak Si, Bangkok 10210, Thailand
4. Laboratory of Natural Products, Chulabhorn Research Institute, 54 Kamphaeng Phet 6 Road, Talat Bang Khen, Lak Si, Bangkok 10210, Thailand
5. Department of Chemistry, Faculty of Science, Kasetsart University, Bangkok 10900, Thailand