Angew. Chem. Int. Ed. 2010, 49, 2332 –2335

Internal Proton Transfer Leading to Stable Zwitterionic Structures in a
Neutral Isolated Peptide**
Anouk M. Rijs,* Gilles Ohanessian,* Jos Oomens, Gerard Meijer, Gert von Helden, and
Isabelle Compagnon*