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Viburnumfocesides A - D, four undescribed 1-O-isovaleroylated iridoid 11-O-allosides modified with (Z / E)-p-coumaric acid, were isolated from the aqueous EtOH extract of the twigs of Viburnum foetidum var. ceanothoides, together with seven known natural products. Their structures were identified on the basis of the spectroscopic data interpretation and chemical derivation studies. Cell-based estrogen biosynthesis assays indicated that viburnumfoceside D (4), (2S,3R)-2,3-dihydro-3-hydroxymethyl-7-methoxy-2-(4-hydroxy-3-methoxyphenyl)-5-b
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