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The IT MS2 product-ion spectrum of the m/z 1675 (*m/z 1676.1) ion (a), and its MS3 product-ion spectra of the ions at m/z 1419 (1675 → 1419) (b), at m/z 1421 (1675 → 1421) (c), at m/z 1393 (1675 → 1393) (d), at m/z 1377 (1675 → 1377) (e). The combined information revealed that the ion is consisted of a major (16:0, 18:1)(19:0/16:1)-PIM2 structure along with five minor isomers (see text for detail). Asterisk = with mass defect.
