PMID:
Chem Pharm Bull (Tokyo). 2005 Feb ;53(2):244-7. PMID: 15684529
Abstract Title:
Bioactive pyranoxanthones from the roots of Calophyllum blancoi.
Abstract:
Phytochemical investigation of the roots of Calophyllum blancoi growing in Taiwan resulted in the isolation of three new pyranoxanthones, blancoxanthone (1), acetyl blancoxanthone (2) and 3-hydroxyblancoxanthone (3), in addition to two known pyranoxanthones, pyranojacaeubin (4) and caloxanthone (5). Structural characterization of the isolated compounds was determined by spectral analyses especially 2-D NMR. Biological study of the isolated xanthones revealed that blancoxanthone (1) exhibited significant anti-coronavirus activity.
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