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We thank Dr Y Hongo in RIKEN for the HRESIMS measurements, Ms H Aono, Ms M Tanaka, Dr J Otaka and Mr K Yamamoto in RIKEN for activity tests. This work was supported in part by JSPS KAKENHI Grant Numbers 24248022 and 26450148, and grant-in-aid from Research Program on Hepatitis from the Japan Agency for Medical Research and Development, AMED.
The authors declare no conflict of interest.
Supplementary Information accompanies the paper on The Journal of Antibiotics website
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