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The MS2 mass spectrum of the [M – H]− ion of m/z 740.5 (a), its MS3 spectra of the ions of m/z 502 (740 →502) (b) and the MS2 mass spectrum of the corresponding [M – H + 2Li]+ ion of m/z 754.7 (c), its MS3 spectra of the ions of m/z 631 (754 →631) (d) and the MS4 spectra of the ions of m/z 307 (754 → 631 → 307) (e). Panel (f) illustrates the fragmentation pathways leading to locate the double bond and cyclopropane group along the fatty acid chain.
