1H and 13C NMR assignments for two new xanthones from the endophytic fungus xylaria sp. FRR 5657
The complete 1H and 13C NMR assignments are reported for the new natural products, 7-hydroxy-3-(hydroxymethyl)-1-methoxy-9H-xanthen-9-one (1) and 2,5-dihydroxy-8-methoxy-6-methyl-9-oxo-9H-xanthene -1-carboxylic acid (2). Both of these secondary metabolites were isolated from the fermentation culture of the endophytic fungus Xylaria sp. FRR 5657. 1D and 2D NMR experiments that included 1H, gCOSY, gHSQC and gHMBC were used for the determination of the structure and assignment of these xanthones. Copyright 頲006 John Wiley & Sons, Ltd.
Magnetic Resonance in Chemistry
Copyright 2006 John Wiley & Sons, Ltd. : Please refer to the publisher for the definitive published version. http://www.interscience.wiley.com/