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The chemical structure and characteristic product ions of CLs. (a) The chemical structures of CLs, consisting of two phospholipid groups, three glycerol groups and four fatty acyl chains. [PA-H]−, [PA-H-R]− and [M-R]− are the major characteristic fragments. (b) The chemical structures and characteristic product ions of CL (18:1)4. (c) The chemical structures and characteristic product ions of CL (14:0)4.
