[1] Univ Milan, Dept Pharmacol Sci, Via Balzaretti 9, Milan, Italy
[2] NIDDK, Lab Bioorgan Chem, NIH, 9000 Rockville Pike, Bethesda, MD 20892 USA
[3] Univ Bonn, Pharmaceut Inst, Immenburg 4, D-53121 Bonn, Germany
[4] Univ Bonn, PharmaCtr Bonn, Pharmaceut & Med Chem, Immenburg 4, D-53121 Bonn, Germany
[5] Goethe Univ, Inst Cell Biol & Neurosci Mol & Cellular Neurobio, Max von Laue Str 13, D-60438 Frankfurt, Germany