Three novel dimeric hydrolysable tannins, gemins A, B, and C, have been isolated from the leaves of Geum japonicum(Thunb.) and their structures, which have α- and β-glucose cores linking through a dehydrodigalloyl group, have been elucidated from spectral and chemical evidence
T. Yoshida, T. Okuda, M. U. Memon and T. Shingu, J. Chem. Soc., Perkin Trans. 1, 1985, 315 DOI: 10.1039/P19850000315
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