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- W2002184577 abstract "Eight anthraquinones were produced by the lichen Nephroma laevigatum Ach. during laboratory incubation. They were characterized by 1H NMR, 13C NMR and mass spectrometry as emodin, 7-chloromodin, 7-chloro-1-O-methylemodin, 7-chloro-1-O-methyl-ω-hydroxyemodin, 5-chloroemodin, 5-chloro-1-O-methylemodin, 5-chloro-1-O-methyl-ω-hydoxyemodin and 5-chloro-ω-hydroxyemodin. The 5-chloroemodins are new lichen substances, although 5-chloro-1-O-methylemodin was isolated previously from a fungus. Radiolabelled 7-chloroemodin derivatives were obtained upon incubation of the lichen with Na [2-14C]acetate, demonstrating the utilization of acetate in their formation. 7-Chloro-1-O-methylemodin, enriched with 13C, was isolated following incubation with Na [1-13C]acetate. Analysis of its 13C NMR spectrum showed that the lichen anthraquinones are biosynthesized through the polyketide pathway. Efficient incorporation of label from Na36Cl into 7-chloroemodin and 7-chloro-1-O-methylemodin showed that the lichen is capable of chlorinating preformed anthraquinones." @default.
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- W2002184577 title "Biosynthetic studies on chlorinated anthraquinones in the lichen Nephroma laevigatum" @default.
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- W2002184577 doi "https://doi.org/10.1016/0031-9422(96)00148-3" @default.
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