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Four unprecedented C 17 -pseudoguaianolides with extended side chains, hookerolides A–D (1–4), were isolated from the whole plants of Inula hookeri. Their structures and absolute configurations were elucidated by a combination of NMR spectroscopy, CD spectrum, and the modified Mosher method. The in vitro bioactivity evaluation suggested that 1–4 possessed moderate to weak anti-inflammatory...
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