1. Division of Environmental Sciences, Chiang Mai University, Chiang Mai 50202, Thailand, Department of Chemistry, University of Wollongong, Wollongong, New South Wales, 2522, Australia, Department of Biology, Chiang Mai University, Chiang Mai 50202, Thailand, Department of Chemistry, Chiang Mai University, Chiang Mai 50202, Thailand, and Department of Chemistry, University of Western Australia, Crawley, Western Australia, 6009, Australia