The chemistry of mould metabolites-III. Structure of cinnabarin (polystictin)

Abstract

Cinnabarin (polystictin) is shown to be 1-carboxy-2-amino-9-hydroxymethylphenoxazin-3-one. Previous degradative and spectroscopic studies on cinnabarin and its derivatives are interpreted on the basis of this structure, which is confirmed by the transformation of methyl cinnabarin into the known 1:9-dimethoxycarbonyl-2-aminophenoxazin-3-one. © 1961.