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Abstract
Two humulane-type sesquiterpenoids, namely (+)-alashanoid I (1a) and (–)-alashanoid I (1b), were isolated as a pair of enantiomers from the peeled stems of Syringa pinnatifolia. Their structures were elucidated by extensive spectroscopic data (1 D and 2 D NMR, UV, and IR), and the absolute configurations were resolved by X-ray diffraction and experimental and calculated ECD data analysis.
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Disclosure statement
No potential conflict of interest was reported by the authors.
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Funding
This paper was financially supported by the National Natural Science Foundation of China [grants number: 81473426 and 81774001], and Jiangxi Synergistic Innovation Center of Modern Technology and Industrial Development of Traditional Ethnic Medicines [grant number: JXXT2018003].