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A new hygrolidin-type macrolide (1), together with one known derivative, oxohygrolidin (2), were isolated from the culture of Streptomyces sp. KIB-H869. The structure of the new compound was elucidated by means of extensive spectroscopic analysis. Moreover, by the biogenesis ratiocination and NMR data comparison, halichomycin and 2 were confirmed to have the same structure, which corrects the structural...
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