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19F‐NMR relaxation filter experiments performed for the fluorine‐containing monosaccharide 2‐fluoro‐fucose (2F‐Fuc) in absence and in presence of the tetrameric lectin DC‐SIGN. The addition of competitor molecules, 1–3 and C3 causes a recovery in the transverse relaxation time (T2) for the fluorinated probe, which is proportional to the relative affinities of the tested compounds.
