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Abstract
Two new C-15 enolic acyl phragmalin-type limonoid orthoesters, chukvelutilide G (1) and chukrasine F (2), were isolated from the stem barks of Chukrasia tabularis var. velutina. Their structures were elucidated by their extensive high resolution-electrospray ionization mass spectrometry (HR-ESI-MS), one- and two-dimensional spectroscopic analysis, including heteronuclear single quantum coherence (HSQC), HMBC and NOESY experiments.
Acknowledgements
This research work was supported by the Key Project of National Natural Science Foundation of China (Grant No. 30830116) and a Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions.