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. 2022 Aug 5;39(5):565–578. doi: 10.1007/s10719-022-10076-6

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Fig. 8 — Negative-ion MALDI MS/MS spectrum of precursor ion at m/z 1418.2, chosen as representative ion peak of the cluster ascribed to mono-phosphorylated tetra-acylated lipid A species and identified by analyzing directly UCF_prec. In the inset it is reported the proposed structure, where the iso-branching of the fatty acids is tentative. Blue dotted lines indicate the cross-ring fragmentations occurred on the non-reducing GlcN3N whose related ion peaks have been reported in bold. Peaks originated from the loss of C₁₅H₃₀O (226 mass units) have been also reported