1. Department of Chemistry; Sorbonne Universités, UPMC Univ Paris 06, PSL Research University, Ecole Normale Supérieure, CNRS, Laboratoire des Biomolécules (LBM); 4 place Jussieu 75005 Paris France
2. Sorbonne Universités; Plateforme de Spectrométrie de Masse et Protéomique, IBPS, FRE3631; 7-9 quai St Bernard 75005 Paris France
3. Present address: Chemistry and Biology of Membranes and Nanoobjects; University of Bordeaux, Bat. B14; allée Geoffroy St Hilaire 33600 Pessac France