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Partial overlapped spectra (A) of 1H-1H COSY (gray), ROESY (blue) and TOCSY (red) of depolymerized product (dFSI′) and possible cross-peaks from H-1 in ROESY marked by blue arrows (B). The capital letters A, B, C and D represent Fuc2S4S, Fuc(2S), Fuc2S and Fuc, respectively.
