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The chemical composition of the hydro-distilled essential oils of Achillea millefolium and Achillea crithmifolia was analyzed by GC, GC–MS, 13C NMR and high resolution LC–MS. For the first time, the use of the combination of different chromatographic and spectral methods, primarily the advantage of LC-Orbitrap over standard methods, enabled the detection of azulenes and their progenitors, in minute...
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