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A new ring‐fused streptovaricin analogue, named ansavaricin J, was unprecedently isolated from the culture of the genetically modified strains ΔstvP5 which derived from Streptomyces spectabilis CCTCC M2017417. Its structure was elucidated via comprehensive spectroscopic analyses, including 1D‐ and 2D‐NMR tests, and HR‐ESI‐MS data analysis. Notably, ansavaricin J and E represent the only two reported...
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