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. 2020 Oct 13;38(2):135–144. doi: 10.1007/s10719-020-09954-8

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© The Author(s) 2020

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Fig. 3 — Negative-ion MALDI MS² spectrum of precursor ion at m/z 1522.6 of the lipid A isolated from. P. pulmonicola RL8228. This is a representative ion peak of the cluster attributed to penta-acylated lipid A species decorated by one phosphate. The main fragments’ assignment is indicated in the spectrum. The proposed structure is given in the inset with the observed sugar ring fragmentations (^0,4A₂ and ^0,2A₂)