STUDIES ON THE MACROLIDE ANTIBIOTIC YL-704 COMPLEX.^* IV

THE STRUCTURES OF MINOR COMPONENTS

Abstract

The structures of minor components of new macrolide YL-704, which were produced by Streptomyces platensis subsp. malvinus MCRL 0388, were elucidated by the physicochemical analyses and the oxidation reaction, and the mass spectrometry of their acetyl derivatives.
The presence of α, β, γ, δ-dienone and α, β-unsaturated γ, δ-epoxy alcohol chromophore was observed in aglycone portions of minor components, in addition to α, β, γ, δ-unsaturated alcohol system such as YL-704 A₁ and B₁.
Furtheremore, at the C-3 position in aglycone part, acetyloxy, propionyloxy and butylyloxy functions were determined together with several acyl groups at the end sugar parts.