Mass spectrometry analysis on Orbitrap Q Exactive of 3-pyridiylcarbinol derivative from 16:4 n-1 isolated from yellow mullet fish oil. (A) Principle of fragmentation based on random proton abstraction on the hydrocarbon chain of 3-pyridylcarbinol fatty acid derivatives according to (Harvey, 1984). (B) Mass spectrum of 3 pyridylcarbinol 6,9,12,15-hexadecatetraenotate showing the various fragments obtained upon electronic impact.