1. The School of Chemistry and
Molecular Biosciences, The University of Queensland, Brisbane, 4072 QLD, Australia
2. Institute of Organic Chemistry
and Biochemistry, Academy of Sciences of the Czech Republic, v.v.i. Flemingovo nam. 2, CZ-166 10 Prague 6, Czech Republic
3. Rega Institute for Medical Research, Katholieke Universiteit Leuven, Minderbroedersstraat
10, B-3000 Leuven, Belgium