1. Department of Organic Chemistry, Arrhenius Laboratory; Stockholm University; S-106 91 Stockholm Sweden
2. Manchester Institute of Biotechnology; University of Manchester; 131 Princess Street Manchester M1 7DN UK
3. Department of Natural Sciences; Middlesex University; NW4 4BT London UK
4. Department of Chemistry; University of Antwerp Groenenborgerlaan 171; 2020 Antwerp Belgium
5. Ghent Quantum Chemistry Group Department of Chemistry; University of Ghent; Krijgslaan 281 9000 Ghent Belgium
6. School of Chemistry; University of Glasgow Joseph Black Building; Glasgow G12 8QQ UK
7. School of Science; RMIT University GPO Box 2476; Melbourne VIC 3001 Australia