Abstract:As a part of systematic studies on Syringa pinnatifolia, a continued phytochemical investigation guided by 1H‐NMR and LC/MS data on the ethanol extract afforded five new dimeric eremophilane sesquiterpenoids, namely syringenes M−Q (1–5). These structures were elucidated by extensive analysis of spectroscopic data, including infrared (IR), high‐resolution electrospray ionization mass spectrometry (HR‐ESI‐MS), nuclear magnetic resonance (NMR), quantum‐mechanics‐based computational analysis of NMR chemical shifts… Show more
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