1. Department of Chemistry and Biochemistry, University of Texas at Arlington, Arlington, TX 76019, USA.
2. Department of Chemistry, Konstanz Research School Chemical Biology, University of Konstanz, 78464 Konstanz, Germany.
3. Department of Chemistry, Umeå University, 901 87 Umeå, Sweden.
4. Department of Bio-Engineering, Royal University of Phnom Penh, Phnom Penh, Cambodia.
5. Department of Molecular Biology, Umeå University, Umeå, 901 87, Sweden.