1. Department of Chemistry; Graduate School of Science; Osaka University; 1-1 Machikaneyama, Toyonaka Osaka 560-0043 Japan
2. ERATO Ito glycotrilogy project Japan Science and Technology Agency (JST); 2-1 Hirosawa, Wako Saitama 351-0198 Japan
3. Synthetic Cellular Chemistry Laboratory; RIKEN; 2-1 Hirosawa, Wako Saitama 351-0198 Japan