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(top) Chemical structure of water-soluble EALA-cryptophane (WEC). (bottom) Hyper-CEST 129Xe NMR spectra for 5–10 μM WEC in a suspension of 1 × 107 cells/mL at pH 7.5: (a) Xe@cells, red trace; Xe@aq, blue trace; (b) Xe@WECaq and at pH 5.5; (c) Xe@cells, red trace; Xe@aq, blue trace; (d) Xe@WECcells, red trace; Xe@WECaq, blue trace. Reproduced with permission from ref (44). Copyright 2015 American Chemical Society.
