1. Department of Chemistry, School of Life Sciences, University of Sussex, Brighton BN1 9QG, UK
2. Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Renmin Street 5626, 130022, Changchun, China
3. School of Chemistry, University of Southampton, University Road, Southampton, SO17 1BJ, UK
4. NMR Research Unit, University of Oulu, P.O. Box 8000, FI-90014, Finland