1. Center for Analysis and Synthesis, Center for Chemistry and Chemical Engineering; Lund University; P.O. Box 124 SE-221 00 Lund Sweden
2. Department of Experimental Medical Science; Lund University, BMC C12; SE-221 84 Lund Sweden
3. Department of Organic Chemistry; Arrhenius Laborator; Stockholm University SE-106 91 Stockholm Sweden
4. Institut de Chimie et Biochimie Moléculaires et Supramoléculaires (UMR 5246); Laboratoire de Chimie Organique 2; Université Claude Bernard Lyon 1 and CNRS; 43 Boulevard du 11 Novembre 1918 F-69622 Villeurbanne France