1. Department of Liberal Arts and SciencesFaculty of EngineeringToyama Prefectural University 5180 Kurokawa Imizu Toyama‐ken 939‐0398 Japan
2. Graduate School of Science and EngineeringUniversity of Toyama 3190 Gofuku Toyama 930‐8555 Japan
3. Division of Natural Products ChemistryInstitute of Natural MedicineUniversity of Toyama 2630 Sugitani Toyama 930‐0194 Japan
4. TAIYO CORPORATION 1‐6‐27 Higashiawaji, Yodogawa‐ku Osaka 533‐0023 Japan
5. Graduate School of Innovative Life ScienceUniversity of Toyama 3190 Gofuku Toyama 930‐8555 Japan