1. Organic Chemistry, Institute of Chemical and Engineering Sciences, ICES; Agency for Science, Technology and Research, A*STAR; 8 Biomedical Grove, Neuros, #07-01 Singapore 138665 Singapore
2. ICMUB, UMR 6302, CNRS, Univ. Bourgogne Franche-Comté; 9, Avenue Alain Savary 21078 Dijon cedex France
3. Institut Universitaire de France; 103, Boulevard Saint-Michel 75005 Paris France