1. Institute
of Health Biosciences and Graduate School of Pharmaceutical Sciences, The University of Tokushima, Tokushima 770-8505, Japan
2. Saito Research Center, Peptide Institute, Inc., 7-2-9 Saito Ibaraki, Osaka
567-0085, Japan
3. Department
of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan