1. Department of Chemistry—BMCUppsala Universitet Husargatan 3 752 37 Uppsala Sweden
2. Department of Chemistry—Ångström LaboratoryUppsala Universitet Lägerhyddsvägen 1 751 20 Uppsala Sweden
3. Institute of Organic ChemistryResearch Center for Natural SciencesHungarian Academy of Sciences Magyar tudósok körútja 2 1117 Budapest Hungary
4. Present address: Department of ChemistryKing's College London London SE1 1DB UK