1. Program of Petrochemistry and Polymer Science, Faculty of Science, The Petroleum and Petrochemical College and The Center for Petroleum, Petrochemicals and Advanced Materials, The Institute of Biotechnology and Genetic Engineering, Department of Otolaryngology Head and Neck Surgery, Faculty of Medicine, and Organic Synthesis Research Unit, Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand