Additional grants have been added to the Acknowledgments. The revised Acknowledgment is shown below. We are grateful to Dr. T. Nakamura of the Molecular Structure Characterization Unit at the RIKEN CSRS for measurement of mass spectra. We also thank Ms. H. Aono, Dr. M. Uchida, Dr. R. Uson, Ms. E. Sanada, and Mr. K. Yamamoto of the Chemical Biology Research Group at the RIKEN CSRS for carrying out bioassays. This research was supported by grants from the Project of the NARO Bio-oriented Technology Research Advancement Institution (Research program on development of innovative technology, 28011A), JSPS KAKENHI Grant Numbers (JP17H06412 and JP18H03945), and the RIKEN SPDR Program (to J.O.).
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