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首次从白桦树皮中分离得到4个纯化合物,经鉴定为游离羟基二聚体缩合鞣质B_1(Ⅲ)、B_2(Ⅳ)及其前体化合物(+)-catechin(Ⅰ)、(—)-epicatechin(Ⅱ)。
Four pure compounds were isolated from birch bark for the first time. They were identified as free hydroxyl dimer condensation enamel B_1 (III), B_2 (IV) and their precursor compounds (+)-catechin (I), (—) -epicatechin(II).