1. Laboratory of Macromolecular Structural Chemistry, Department of Chemistry, K.U.Leuven, Celestijnenlaan 200F, Heverlee, Belgium
2. POLY-tech S.C.r.l., AREA Science Park, Padriciano 99, I-34012 Trieste, Italy
3. Department of Biochemistry, Biophysics and Macromolecular Chemistry, University of Trieste, via L.Giorgieri 1, I-34127 Trieste, Italy