Metabolic products of microorganisms. 252. Isolation of new nikkomycins from Streptomyces tendae.

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Abstract
Two new nikkomycins were isolated from the culture broth of Streptomyces tendae Tu 901/PF 53+-3. The new compounds are the dipeptide nikkomycin psuedo-Z (.PSI. Z) and tripeptide nikkomycin pseudo-J (.PSI. J), which are analogues to nikkomycins Z and J. Nikkomycins pseudo-Z and pseudo-J have a C-glycosidic linkage between uracil and 5-amino-5-deoxy-D-allo-furanuronic acid, which is comparable to the C-glycosidic bond in pseudouridine. The new CC-nucleoside nikkomycins exhibit a lower biological activity than the CN-nucleoside nikkomycins.