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Variation of the amide I′ spectra of small peptide derivatives under the influence of increased hydrostatic pressure. a) contains the pressure dependent shift for 0.25 m N-acetyl-glycine-methylamide, b) for 0.25 m N-acetyl-L-alanine-N′-methylamide, and c) for 0.25 m N-acetyl-L-leucine-N′-methylamide.
