[1] Univ Pisa, Dipartimento Sci Farmaceut, I-56126 Pisa, Italy
[2] Heptares Therapeut Ltd, Welwyn Garden City AL7 RAX, Herts, England
[3] Univ Padua, Dipartimento Sci Farmaceut, Mol Modeling Sect, I-35131 Padua, Italy
[4] Lundbeck AS, DK-2500 Copenhagen, Denmark