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Tandem spectra of (a) [1,3,4,1,6]5-, m/z 373, and its modified product (b) [1,3,4,4,3]-3d33- at m/z 560.8, (c) [1,3,4,1,7]5-, m/z 389 and its modified product [1,3,4,4,4]-3d34- at m/z 460. Major backbone fragments were assigned in Domon-Costello Convention in (b) and (d). Diamonds denote precursor ions, asterisks denote loss of sulfate ions
