1. National Center for Genetic Engineering and Biotechnology, National Science and Technology Development Agency, Pathumthani 12120, Thailand; Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand; Department of Biochemistry, Faculty of Science, Mahidol University, Bangkok 10400, Thailand, and The Dyson Perrins Laboratory, Department of Chemistry, Oxford University, South Parks Road, Oxford, OX1 3QY, U.K.