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In our recent report of structural studies of urdamycins B to Fx), we published partial structures of urdamycins C and D, the two largest molecules amongthe complexof angucycline antibiotics produced by Streptomyces fradiae (strain Tu 2717)2). Nowwe can complete both structures, which are represented by the formulae 1 (urdamycin C) and 2 (urdamycin D). After several unsuccessful attempts to obtain crystals of either the natural products themselves or of derivatives, we tried to solve the structures by a biosynthetic approach. Comparison of the NMRdata of urdamycin C (1) and of urdamycin D (2) with those of urdamycin A (3)

Urdamycins, new angucycline antibiotics from Streptomyces fradiae. III. The structures of urdamycins C and D.