Abstract
A YELLOW colouring matter with powerful anthelminthic properties has recently been isolated1 from the leaves of Calycopteris floribunda, Lamk., and the constitution of a dihydroxytetramethoxyflavone ascribed to it. Since it yielded p-hydroxybenzoic acid by degradation with alkali, it became obvious that all the six positions of the fused benzene ring were occupied and the substance was a remarkable instance of a pentahydroxybenzene derivative occurring in Nature. Demethylation gave a new hexahydroxyflavone, calycopteretin.
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References
Ratnagiriswaran, Sehra and Venkataraman, Biochem. J., 28, 1964 1934.
Karrer, Helv. Chim. Acta, 17, 1560; 1934.
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KARRER, W., VENKATARAMAN, K. Identity of Calycopterin and Thapsin. Nature 135, 878 (1935). https://doi.org/10.1038/135878b0
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DOI: https://doi.org/10.1038/135878b0
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