Metabolic Products of Fungi. XIII. The Structure of Oxyskyrin.

抄録

The pigment B, isolated from Penicillium islandicum SOPP, N. R. R. L. 1175, and also found in the mycelium of Endothia parasitica ANDERSON ET ANDERSON, was studied. The pigment B which was named oxyskyrin gave a molecular formula, C₃₀H₁₈O₁₁, and yielded heptaacetate and heptabenzoate. On reductive cleavage with alkaline sodium dithionite, oxyskyrin was decomposed to give emodin and ω-hydroxyemodin. On oxidation with chromium trioxide, oxyskyrin heptaacetate was converted into skyric acid hexaacetate. Consequently, oxyskyrin was formulated as 2, 4, 5, 2', 4', 5'-hexahydroxy-7-methyl-7'-hydroxymethyl-bianthraquinone-(1, 1').