1. Forschungszentrum
Jülich GmbH Institute of Complex Systems: Structural Biochemistry
(ICS-6), 52425 Jülich, Germany
2. University Chemical Laboratories, Lensfield Road, Cambridge CB2 1EW, U.K.
3. Institute
of Theoretical and Computational Chemistry, Heinrich Heine University Düsseldorf, 40225 Düsseldorf, Germany