Chemical and chemotaxonomical studies of filices. LXI. Chemical studies on the constituents of Pronephrium triphyllum Hollt

From the fronds of Pronephrium triphyllum HOLLT., three new glycosides, named triphyllins A, B and C, were isolated. Their structures were determined as (2R, 4S)-5, 7-di-β-D-glucosyloxy-6-hydroxymethyl-4'-methoxy-8-methylflavan-4-ol, (2R, 4S)-5, 7-di-β-D-glucosyloxy-4'-hydroxy-6-hydroxymethyl-8-methylflavan-4-ol and (2S)-7-β-D-glucosyloxy-5-hydroxy-4'-methoxy-6-methoxymethyl-8-methylflavanone, respectively, on the basis of spectral data and chemical correlations.