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1H NMR spectra for P7, P6, and P7 analogs V1I, V1T, V1S, and V1L. The more well-structured peptides (P7, V1I, and V1T) have a wider span of amide chemical shifts, whereas the less well-structured peptides (V1S, V1L, and P6) have a narrower span of amide chemical shifts.
