Tannins of theaceous plants. II. Camelliins A and B, two new dimeric hydrolyzable tannins from flower buds of Camellia japonica L. and Camellia sasanqua Thunb.

Abstract

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.