1. DSM Innovative
Synthesis
BV, P.O. Box 18, 6160 MD Geleen, The Netherlands
2. Department
of Chemistry and Applied Biosciences, ETH Zürich, Vladimir
Prelog Weg. 2 CH-8093 Zürich, Switzerland
3. Crystal
and Structural Chemistry, Bijvoet Center for Biomolecular Research, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands