Structural elucidation of the nigerones, four new naphthopyrones from cultures of Aspergillus niger
Journal of the Chemical Society, Perkin Transactions 1, Year 1980
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The isolation and structure of four new pigments, nigerone (1a), 6′-O-demethylnigerone (1b), isonigerone (2), and heminigerone (3), are described. A study of the chiroptical properties of the dimers indicates the S-configuration.