1. Dep. Química Orgánica I, Fac. C. C. Químicas; Univ. Complutense de Madrid; Avd. Complutense s/n 28040 Madrid Spain
2. Bioorganische Chemie, Gebäude NW1; Universität Bayreuth; 95440 Bayreuth Germany
3. Dep. Química, Fac. Farmacia; Univ. CEU-San Pablo; Madrid Spain
4. Dep. Biología Físico Química; CIB-CSIC; C/ Ramiro de Maeztu 9 28040 Madrid Spain
5. Department of Chemistry; University of Basel; Spitalstrasse 51 4056 Basel Switzerland
6. CIC bioGUNE; Bizkaia Science and Technology Park, Building 801A 48160 Derio Spain
7. IKERBASQUE , Basque Foundation for Science; 48009 Bilbao Spain