Synthesis of (1S,2S,3R,8S,8aR)-1,2,3,8-Tetrahydroxy-6-oxa-5-thioxoindolizidine: A Stable Reducing Swainsonine Analog with Controlled Anomeric Configuration - Díaz-Pérez, P; García-Moreno, M I; Ortiz Mellet, C; García Fernández, J M (Synlett, 2003)