[1] Scripps Res Inst, La Jolla, CA 92037 USA
[2] Inst Curie, Paris, France
[3] Univ Cambridge, Cambridge, England
[4] Inst Chim Subst Nat, CNRS, Gif Sur Yvette, France
[5] Inst Curie, Rech, Paris, France
[6] Humboldt Univ, Berlin, Germany
[7] Grp Herbert Waldmann, Karlsruhe, Germany
[8] Max Planck Inst Mol Physiol, Dortmund, Germany
[9] Humboldt Univ, Organ & Bioorgan Chem, Berlin, Germany