Japonicones A-D, bioactive dimeric sesquiterpenes from Inula japonica Thunb

Bioorganic & Medicinal Chemistry Letters
Jiangjiang QinWeidong Zhang

Abstract

Four new dimeric sesquiterpene lactones japonicones A-D (1-4), comprised by eudesmane and guaiane sesquiterpenes, were isolated from the aerial part of Inula japonica Thunb. The structures and stereochemistry of 1-4 were elucidated by use of 2D NMR spectroscopic techniques, X-ray crystallography and modified Mosher method. Japonicone A (1) showed the most potent cytotoxicities against four tumor cell lines, A549, LOVO, CEM and MDA-MB-435.

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