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LC-NETD-MS/MS sequencing of pentasulfated tetramer 5b: (a) precursors of 5b from LC-MS without the ion suppressor; (b) precursors of 5b from LC-MS with the ion suppressor; and (c) annotated LC-NETD-MS/MS spectrum of 5b acquired at the retention time of 100.62 min; S, sulfate; A, NETD reagent.
