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. Author manuscript; available in PMC: 2022 Jan 1.
Published in final edited form as: Mass Spectrom Rev. 2020 Sep 30;41(1):15–31. doi: 10.1002/mas.21659

Figure 8.

Figure 8.

The fragmentation pathway proposed for the formation of the sodiated cycloethylene C1P diester. In-source fragmentation of sodiated SM species produces the sodiated cycloethylene C1P (m: n) diester counterparts, which is an isomer of sodiated C1P (m+2: n+1) ion, leading to mis-interpretation of these ion-source yielded artifacts. C1P and SM abbreviate ceramide 1-phosphate and sphingomyelin, respectively. m and n represent the total number of carbon atoms and the total number of double bonds in both the ceramide backbone and the fatty acylamide in C1P.