1. Laboratorium für Organische Chemie, HCI H335; Eidgenössische Technische Hochschule Zürich; Vladimir-Prelog-Weg 3 8093 Zürich Switzerland
2. Department of Drug Discovery Sciences, Kitasato Institute for Life Sciences and Graduate School of Infection Control Sciences; Kitasato University; 5-9-1 Shirokane, Minato-ku Tokyo 108-8641 Japan