Nine compounds, ursolic acid (1), β‐sitosteryl glucoside (2), umbelliferone (3), uncarine‐A (4), chlorogenic acid (5), rutin (6), neohesperidin (7), quercitrin (8)and afzelin (9) were isolated and characterized from fresh leaves of Uncaria hirsuta . Their structures were elucidated by spectral methods. Among them, uroslic acid (I) exhibited a cytotoxic principle of this plant.
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Wu et al. (1994) studied this question.
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