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Relative relaxation behavior of the multiple labeled variants shown as Arrhenius plots. Isotope 13C=O modes were probed at ∼ a) 1588 and b) 1608 cm−1 for 1W‐4–13 (blue squares), 1W‐13–20 (red circles), and 1W‐4–13–20 (gray triangles). The lines represent fits to the Arrhenius equation to provide a qualitative description of the temperature dependence.
