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Structural examination of the metabolic pool of the aerial parts of Pelargonium sidoides DC has led to the isolation of two new metabolites, 4-allyl-2,5-dimethoxyphenol-1-β -D-glucopyranoside and 6,7-dihydroxycoumarin-8-sulfate, along with a series of uncommon compounds including (2R,3R)-(+)-dihydroquercetin-3-β -glucopyranoside, (2R,3R)-(+)-dihydrokaempferol-3-β - glucopyranoside, fraxetin-7-β -glucopyranoside, 7-methoxycoumarin-6-β -glucopyranoside, umckalin, orientin-2”-gallate, and isoorientin-2”-gallate. They are accompanied by the widespread isoorientin, orientin, fraxetin, (2R,3S)-epigallocatechin-3-gallate, gallic acid and protocatechuic acid. The structures of the compounds were established from spectroscopic studies. Determination of configurations was achieved by circular dichroism.

A Phenol Glucoside, Uncommon Coumarins and Flavonoids from Pelargonium sidoides DC