Two novel tannins, stenophynins A and B, isolated from the bark of Quercus stenophylla MAKINO (Fagaceae), have been characterized on the basis of chemical and spectroscopic evidence as (+)-catechin 8-C-β-D-[2", 3" : 4", 6"-bis(S)-hexahydroxydiphenoyl]-glucopyranoside (1) and (+)-catechin 8-C-β-D-[2", 3"-(S)-hexahydroxydiphenoyl-6"-galloyl]-glucopyranoside (2), respectively.
根据
化学和光谱证据,从栎树树皮(椑科)中分离出两种新型
单宁--
儿茶素 A 和 B,它们分别是(+)-
儿茶素 8-C-β-D-[2",3":4",6"-双(S)-六羟基二苯甲酰基]-
吡喃
葡萄糖苷(1)和(+)-
儿茶素 8-C-β-D-[2",3"-(S)-六羟基二苯甲酰基-6"-galloyl]-
吡喃
葡萄糖苷(2)。