1. Natural Products and Glycotechnology Research Institute Inc. (NPG), 4118 Swarthmore Road, Durham, 27706 North Carolina, USA, Fax: (internat.) +1‐919‐493‐6113
2. Instituto de Química Orgánica General (CSIC), Juan de la Cierva 3, 28006 Madrid, Spain, Fax: (internat.) +34‐91‐564‐4853