1. Physical Chemistry 1, Center for Chemistry and Chemical Engineering, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden, Department of Bioelectrochemistry and Biospectroscopy, Institute of Biochemistry, Mokslininkø 12, LT-086 62 Vilnius, Lithuania and Camurus AB, Sölvegatan 41, Ideon Science Park Gamma 1, SE-223 70 Lund, Sweden