1. Natural Product Biosynthesis Research Unit, RIKEN Center for Sustainable Resource Science, Wako, Saitama 351-0198, Japan
2. Department of Applied Biological Chemistry, Faculty of Agriculture, Kindai University, Nara, Nara 631-8505, Japan
3. Chemical Biology Research Group, RIKEN Center for Sustainable Resource Science, Wako, Saitama 351-0198, Japan
4. Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan