Abstract

The structures of janthinocins A, B and C, three novel macrocyclic peptide lactone antibiotics isolated from fermentations of Janthinobacterium lividum, were determined. The janthinocins are of particular interest because they contain three amino acid residues that have not previously been reported in natural products: Each contains erythro-beta-hydroxy-D-leucine while janthinocins A and B also contain beta-hydroxytryptophan and beta-ketotryptophan, respectively.

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