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