1. Department of Chemistry, Graduate
School of Science, Osaka University, Toyonaka,
Osaka 560-0043, Japan
2. ERATO,
Lipid Active Structure
Project, Japan Science and Technology Agency, Toyonaka, Osaka 560-0043, Japan
3. Department of Chemistry, Graduate
School of Sciences, Kyushu University,
Higashi-ku, Fukuoka 812-8581, Japan