title: 1H and 13C NMR assignments for two new xanthones from the endophytic fungus Xylaria sp. FRR 5657.
abstract: 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.
authors.affiliation: Natural Product Discovery, Eskitis Institute, Griffith University, Brisbane, QLD 4111, Australia. r.davis@griffith.edu.au
authors.forename: Rohan A
authors.initials: RA
authors.lastname: Davis
authors.forename: Gregory K
authors.initials: GK
authors.lastname: Pierens
mesh_terms: D002247:Carbon Isotopes / Q000032:analysis; D006859:Hydrogen / Q000032:analysis; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D044004:Xanthones / Q000737:chemistry* / Q000302:isolation & purification; D013098:Xylariales / Q000378:metabolism*
chemical_list: C522483:2,5-dihydroxy-8-methoxy-6-methyl-9-oxo-9H-xanthene-1-carboxylic acid; C522482:7-hydroxy-3-(hydroxymethyl)-1-methoxy-9H-xanthen-9-one; D002247:Carbon Isotopes; D044004:Xanthones; D006859:Hydrogen