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- W2030397312 abstract "A novel naphthopyrone derivative, named quinquangulone (1), has been isolated from Cassia quinquangulata, along with the known compounds quinquangulin (2) and its two glycosides (3 and 4), rubrofusarin (5) and its two glycosides (6 and 7), nor-rubrofusarin (8) and its 6-O-glucoside (9), and three stilbenes (10-12). The structure of quinquangulone was established by spectral interpretation as 5,9-dihydroxy-8-methoxy-2,9-dimethyl-6-oxo-4H,6H,9H-naphtho-[2,3-b]pyran-4-one. Reinvestigation of the NMR spectra of quinquangulin led to revision of its structure as 5,6-dihydroxy-8-methoxy-2,9-dimethyl-4H-naphtho[2,3-b]pyran-4-one (2a). The structures of two quinguangulin glycosides, 3 and 4, were also revised accordingly. Compound 2a exhibited activity against Staphylococcus aureus and methicillin-resistant S. aureus (MIC, 3.125 and 6.25 microg/mL, respectively)." @default.
- W2030397312 created "2016-06-24" @default.
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- W2030397312 date "2001-08-22" @default.
- W2030397312 modified "2023-09-28" @default.
- W2030397312 title "A New Naphthopyrone Derivative from <i>Cassia quinquangulata </i>and Structural Revision of Quinquangulin and Its Glycosides" @default.
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- W2030397312 doi "https://doi.org/10.1021/np010173h" @default.
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