Metabolic Products of Fungi. XXIII. On Ustilaginoidins. (3). The Structures of Ustilaginoidins B and C.

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The structures of ustilaginoidin B, C₂₈H₁₈O₁₁, m.p. >300°, [α]²⁵_D-360°(dioxan) and ustilaginoidin C, C₂₈H₁₈O₁₂, m.p. >300°, [α]²⁵_D-260°(dioxan) which were isolated as the pigments of Ustilaginoidea virens (COOKE) TAKAHASHI, were studied mostly by the NMR spectral analyses of their peracetates to conclude as being formulated as II (R=H) and III (R=H), respectively.