The isolation and structure of four new pigments, nigerone (la), 6′-O-demethylnigerone (1b), isonigerone (2), and heminigerone (3), are described. A study of the chiroptical properties of the dimers indicates the S-configuration.
D. P. Gorst-Allman, P. S. Stern and C. J. Rabie, J. Chem. Soc., Perkin Trans. 1, 1980, 2474 DOI: 10.1039/P19800002474
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