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(a) A graph of the relative intensities of 2,4An CID fragments obtained from the two dp8 chains. The ions indicated with an arrow have the diagnostic qualities discussed in the text. (b). Mass scale expansion highlighting the 2,4An fragments obtained in CSA and DS with [2,4A7 +2Na]3− almost exclusively in CSA. (c). A structure with the fragment ions obtained from [M-7H+2Na]5− precursor. 2,4A and 0,2X fragments are shown in red within the structure.
