1. Department of Chemistry; Davenport Chemical Laboratories; University of Toronto; 80 St. George Street Toronto Ontario M5S 3H6 Canada
2. Carbogen Amcis AG; Hauptstraße 171 4416 Bubendorf Switzerland
3. Bayer Pharma Aktiengesellschaft; Aprather Web 18a 42113 Wuppertal Germany
4. Technische Universität Dortmund; Otto-Hahn-Straße 4a 44227 Dortmund Germany
5. Department of Organic Chemistry; University of Geneva; 30 Quai Ernest Ansermet 1211 Geneva Switzerland