Three new quinic acids derivatives, 3--caffeoyl-5--galloylquinic acid (), 3---caffeoly-5--galloylquinic acid methyl ester (), 3---caffeoyl-4--galloylquinic acid methyl ester (), and a new shikimic acid derivative as orthacanthain A (), along with three known compounds, 3--caffeoylquinic acid (), methyl-3--galloylquinic acid (), and emblifatmin (), were isolated from the 70% methanol extract of the leaves of France. The structures of all compounds were identified by optical rotation, MS, UV, IR, 1D and 2D NMR spectral data and comparison with literature. The IC value of compound was (0.024±0.009) mmol/L, which had strong inhibitory activity on α-glucosidase.

中文翻译：

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来自苦槠叶的三种新的奎尼酸衍生物和一种新的莽草酸衍生物


三种新的奎尼酸衍生物，3--咖啡酰-5-没食子酰奎尼酸()、3--咖啡酰-5--没食子酰奎尼酸甲酯()、3--咖啡酰-4-没食子酰奎尼酸甲酯()从 70% 甲醇提取物中分离出一种新的莽草酸衍生物 Orthacanthain A ()，以及三种已知化合物：3--咖啡酰奎尼酸 ()、甲基-3--没食子酰奎尼酸 () 和 emblifatmin ()法国的树叶。所有化合物的结构均通过旋光度、MS、UV、IR、1D和2D NMR光谱数据以及与文献的比较来鉴定。化合物的IC50值为（0.024±0.009）mmol/L，对α-葡萄糖苷酶具有较强的抑制活性。