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LC-NETD-MS/MS sequencing of heptasulfated hexamer 7a: (a) precursors of 7a from LC-MS without the ion suppressor; (b) precursors of 7a from LC-MS with the ion suppressor; and (c) annotated LC-NETD-MS/MS spectrum of 7a acquired at the retention time of59.54 min; RE, O(CH2)5NH2.
