Two new dimeric hydrolyzable tannins, camelliins A and B, which exist as equilibrium mixtures of anomers, have been isolated from flower buds of Camellia japonica L., and their structures were elucidated. Camelliin B belongs to a unique class of dimers having a macrocyclic structure. The flower of Camellia sasanqua THUNB. yielded five tannins which were identical with those of C. japonica.
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Yoshida et al. (1990) studied this question.
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