a
University of St Andrews, School of Chemistry and Centre for Biomolecular Sciences, North Haugh, St Andrews, Fife, UK
E-mail: do1@st-andrews.ac.uk
;
Fax: +44 (0)1334 463800
;
Tel: +44 (0)1334 467171
b
Merck KGaA, Frankfurter Str. 250, D 64293 Darmstadt, Germany