1. The School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, Brisbane 4072, Queensland Australia
2. Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, v.v.i. Flemingovo nám. 2, CZ-166 10 Prague 6, Czech Republic
3. Rega Institute for Medical Research, KU Leuven—University of Leuven, Minderbroedersstraat 10, B-3000 Leuven, Belgium
4. Department of Drug Evaluation, Australian Army Malaria Institute, Enoggera, Brisbane, Queensland 4051, Australia