1. Polymer Science Program, Faculty of Science, Prince of Songkhla University, Songkhla 90112, Thailand
2. Department of Organic and Inorganic Chemistry, Federal University of Ceará, CX 12200 Fortaleza, Brazil
3. School of Pharmacy and Pharmaceutical Sciences, University of Manchester, Manchester M13 9PL, U.K.
4. Department of Chemistry, University of Manchester, Manchester M13 9PL, U.K.