Abstract
correlation with this carbon (134.5 ppm) in its HMBC spectrum. The methyl proton (H-11) in the ring B showed a NOESY peak with H-8 aromatic proton, which in turn showed NOESY correlation with anomeric proton (H-1') of a sugar moiety, thereby suggesting the sugar residue is placed at C-7 position. This was further confirmed by HMBC correlation observed between H-1' and C-7. The
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