1957 Volume 5 Issue 6 Pages 573-575
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').