Alnusnins A and B from the leaves of Alnus sieboldiana

Article abstract of DOI:10.1016/0031-9422(89)80302-4

Two new ellagitannins, alnusnins A and B, have been isolated from the leaves of Alnus sieboldiana (Betulaceae) and characterized as 1-O-galloyl-2,3-(S)-hexahydroxydiphenoyl-4,6-(S)-tergalloyl-β-d-glucose and 2,3-(S)-hexahydroxydiphenoyl-4,6-(S)-tergalloyl-d-glucose, respectively, by chemical and spectral evidence. The occurrence of eight known tannins, 1,2,6-tri-O-galloyl-β-d-glucose, strictinin, casuarinin, stachyurin, pedunculagin, 1(β)-O-galloylpedunculagin and stenophyllanin A, and two flavonoids, pinocembrin and quercetin 3-O-β-d-glucuronide, has also been demonstrated.