A new biflavonoid, 4'-methoxydaphnodorin E, was isolated from the antiviral fraction of Wikstroemia indica against respiratory syncytial virus (RSV). Its structure was determined on the basis of extensive spectroscopic data including HR-ESI-MS and 2D NMR. The biflavonoid was tested for its in vitro anti-RSV activity with cytopathic effect (CPE) reduction assay, and displayed potent effect with 50% inhibitory concentration (IC₅₀) value of 2.8 μM and selective index (SI) value of 5.4.
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Huang et al. (2012) studied this question.
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