[Studies on the chemical constituents of Uncaria yunanensis Hsia. C.C].

ABSTRACT

AIM: To research the chemical constituents from dried roots of Uncaria yunanensis Hsia. C. C. METHODS: Modern chromatography was used to isolate chemical components. Their structure were identified by spectral analysis. RESULTS: Seven compounds were isolated and identified as 3 beta, 6 beta, 19 alpha-trihydroxyurs-12-en-28 oic acid (I), 23-nor-24-esomethylene-3 beta, 6 beta-19 alpha-trihydroxyurs-12-en-28 oic acid (II), 3-oxo-6 beta, 19 alpha-dihydroxyurs-12-en-28 oic acid (III), oleanic acid (IV), 5,7,3',4'-tetrahydroxy-flavan-3-ol (V), beta-yohimbine (VI) and diangoutengjian I (VII). CONCLUSION: All of the above compounds were isolated for the first time from the root of this plant. Among them, compound VII is a new one.