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The 1H NMR spectral change of 5, 6, and 8 (aromatic regions) after the addition of TCA in D2O at pD 7.0 ± 0.2 and 35°C: A, 3.0 mM 5; B, 3.0 mM 5 + 1.0 mM TCA; C, 3.0 mM 5 + 2.0 mM TCA; D, 0.5 mM 6; E, 0.6 mM 6 + 0.4 mM TCA; F, 0.5 mM 8; and G, 0.5 mM 8 + 0.5 mM TCA.
