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Journal Article
Research Support, Non-U.S. Gov't
Antiviral glycosidic bisindole alkaloids from the roots of Isatis indigotica.
Seven new glycosidic bisindole alkaloids, isatindigobisindolosides A-G (1-7), were isolated from an aqueous extract of the Isatis indigotica roots. Their structures including absolute configurations were determined by spectroscopic and chemical methods, together with calculations of electronic circular dichroism (ECD) spectra based on the quantum-mechanical time-dependent density functional theory. In the NMR spectra of 1-3, it is found that integration of H-2 and intensity of C-2 are affected not only by a substitution group at C-2 but also by solvents. Influences of the glucopyranosyloxy on the calculated ECD spectra of the glycosidic bisindole alkaloids are discussed. Compounds 2, 5, and 6 showed antiviral activity against both the influenza virus A/Hanfang/359/95 (H3N2) and Coxsackie virus B3 with IC50 values of 8.4-100.0 μM.
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