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Extracted‐ion chromatograms (m/z 211.0623, mass tolerance=5 ppm) of 4DFS (A) and 3DFS (B) uptake assays with human fibroblasts. Extracted‐ion chromatograms (m/z 291.0286, mass tolerance=5 ppm) for corresponding sugar phosphates 4DFS7P (C) and 3DFS7P (not detected, D) in the same samples. HILIC‐MS analysis was done with cell lysates, see Experimental Section and Supporting Information for experimental details. RT=retention time.
