1. 10) Insulin mimetic activity assay was performed as written in reference 9.
2. 11) Commercial products were used without further purification. Compounds2,8–12(>98%) were purchased from Wako Pure Chem. Ind., Ltd.13(>98%) was purchased from Carbosynth Ltd.14(>97%) was purchased from Seikagaku Biobusiness Co.15(>96%) was purchased from Tokyo Chem. Ind., Co., Ltd.