1. Molecular Biotechnology; Institute of Biology; Leiden University; Sylviusweg 72 2333 BE Leiden The Netherlands
2. Research Institute of Pharmaceutical Sciences; Musashino University; Shinmachi Nishitokyo-shi Tokyo 202-8585 Japan
3. Natural Products Laboratory, Institute of Biology; Leiden University; Sylviusweg 72 2333 BE Leiden The Netherlands