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Isolation and characterization of Brachystemidines A-E, novel alkaloids from Brachystemma calycinum
Yong-Xian Cheng1, Jun Zhou, Ning-Hua Tan
1Laboratory of Phytochemistry, Kunming Institute of Botany, The Chinese Academy of Sciences, Kunming 650204, People's Republic of China.
Journal of Natural Products
|May 25, 2002
Abstract:
Five novel alkaloids, brachystemidines A-E (1-5), were isolated from the roots of Brachystemma calycinum. Their structures were established by spectral data, especially by 1D and 2D NMR techniques. The crystal structure of brachystemidine D was determined via X-ray diffraction analysis.