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-. , G. , Y. France, F. Belgium-), and M. A. Ms, The authors thank Prof la neuve, Belgique) for their helpful contribution. Encore is a collaborative project involving five active sites: (a) Facultés, ACKNOWLEDGEMENTS This work has been supported by the FNRS (Fonds National de la recherche Scientifique Dr E. Untersteller (Institut de Chimie des Substances Naturelles ICSN Institut de Chimie des Substances Naturelles ICSN-CNRS) (c) Laboratoire d'Informatique, de Robotique et de Microélectronique de Montpellier (Lirrm)