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1. (Article ID: 11636)
 
Guo Y, Kojima K, Lin L, Fu X, Zhao C, Hatano K, Chen Y, Ogihara Y
A new N-methyltetrahydroprotoberberine alkaloid from Tinospora hainanensis
Chemical and Pharmaceutical Bulletin 47(2) (1999) 287-289
 

Several species of the genera Tinospora (Menispermaceae) are widely distributed over Asia and Africa and are well-known for their medicinal properties. From the stems of Tinospora hainanensis, a new N-methyltetrahydroprotoberberine alkaloid, N-methyltetrahydrocolumbamine, was isolated and characterized on the basis of NMR, MS and X-ray.

crystal structure, Menispermaceae, N-methyltetrahydrocolumbamine, tetrahydroprotoberberine, Tinospora hainanensis

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