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Two new O-terpenoidal coumarins named excavacoumarin A (2). B (3). and a known one 1 were isolated from the leaves of Clausena excavata Burm. f: (Rutaceae) collected in Xishuangbanna, Yunnan. Structure elucidation and unambiguous NMR assignments for the title compounds were carried out on the basis of 1D and 2D NMR experiments.
Two new O-terpenoidal coumarins named excavacoumarin A (2). B (3). And a known one 1 were isolated from the leaves of Clausena excavata Burm. F: (Rutaceae) collected in Xishuangbanna, Yunnan. Structure elucidation and unambiguous NMR assignments for the title compounds were carried out on the basis of 1D and 2D NMR experiments.