1. Institute
of Structural and Molecular Biology and Department of Biological Sciences,
School of Science, Birkbeck University of London, Malet Street, London WC1E 7HX, U.K.
2. CIRCE Crystal Engineering, 07121 Palma de Mallorca, Spain
3. Unitat
de Polimorfisme i Calorimetria, CCiT, Universitat de Barcelona, 08028 Barcelona, Spain