Among them, the amino acid NH 3+ stretching vibration at 2,938 cm 1 , the sulfur hydrogen S-H stretching vibration at 2,524 cm 1 , the carboxylate COO stretching vibration at 1,712 cm 1 , the carbonyl C=O bond stretching (amide I) vibration at 1,660 cm 1 , and the CN Hbond bending vibration (secondary amide amide II) at 1,395 cm 1 , the carboxylic acid root COO symmetric stretching vibration at 1,395 cm 1 , and the CN stretching vibration caused by CN stretching vibration at 1,248 cm 1
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