1. Department of Chemistry, Universitat de Girona, Campus de Montilivi, s/n. E-17071-Girona, Spain
2. Department of Chemistry, Universitat Autònoma de Barcelona, Cerdanyola del Vallès, E-08193-Barcelona, Spain
3. Bayer Industry Services, Analytics X-ray Laboratory, Geb. Q18, Raum 490, Bayer AG, D-51368-Leverkusen, Germany