Abstract
A new oxindole alkaloid, isomitraphyllinol (1), was isolated from the leaves of Thai Mitragyna hirsuta, together with five known oxindole alkaloids (2–6). The structure of the new compound was determined by spectroscopic analysis.
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Acknowledgments
This work was financially supported by a Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science, and Technology, Japan, and by a grant from the Japan Health Sciences Foundation.
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Kitajima, M., Nakayama, T., Kogure, N. et al. New heteroyohimbine-type oxindole alkaloid from the leaves of Thai Mitragyna hirsuta . J Nat Med 61, 192–195 (2007). https://doi.org/10.1007/s11418-006-0114-7
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DOI: https://doi.org/10.1007/s11418-006-0114-7