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Crystal structure and NMR analysis of the alkaloid protostemotinine

✍ Scribed by Xiaodong Cong; Haoru Zhao; Dominque Guillaume; Guojun Xu; Yang Lu; Qitai Zheng


Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
153 KB
Volume
40
Category
Article
ISSN
0031-9422

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## Abstract The single‐crystal X‐ray structures of speciophylline, mitraphylline, and rhynchophylline, oxindole alkaloids from the Peruvian climbing vine __Uncaria tomentosa__ (Rubiaceae), were determined. The three compounds show Nβ‹…β‹…β‹…Hο£ΏN hydrogen bonding, which has not been observed in the crystal