Aurantosides D, E, and F: New Antifungal Tetramic Acid Glycosides from the Marine Sponge Siliquariaspongia japonica

Abstract
Aurantosides D−F (4−6), new polyene tetramic acids comprising an N-trisaccharide unit, have been isolated from the marine sponge Siliquariaspongiajaponica. Their structures were determined by spectral and chemical methods. A reinvestigation of NMR data of the previously isolated aurantosides A and B led to revision of the geometry of the terminal double bond. Aurantosides exhibit potent antifungal activity against Aspergillus fumigatus and Candida albicans.

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