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MS2 of 844.5633, the chloride adduct [M+Cl]- of egg yolk GPC 38:4. The product ions clearly indicate that the sn-2 fatty acid is 20:4 (303.2329; 0.32 ppm) and sn-1 is 18:0 (283.2642; 0.77 ppm), supporting the identity of GPC 38:4 as mainly GPC 18:0/20:4, with trace quantities of GPC 18:1/20:3 (281.2486/305.2486). Abbreviation: GPC, glycerophoscholines.
