A new hydrolyzable tannin, sanguiin H-6, has been isolated from the underground parts of Sanguisorba officinalis L. (rosaceae), and on the basis of spectroscopic data and partial hydrolysis study has been shown to have a novel dimeric structure containing sanguiin H-2 and pedunculagin moieties.
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Nonaka et al. (1982) studied this question.