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The interest to amino acid amides arises from their biological important role. Some C- nGBP\-amidated amino acids Ile, Val, Thr, Ser, Met, Trp, Gln and Arg have been studied by single crystal X-ray diffraction. The most C-GBP\-amides are much more biologically active, comparing with the corresponding C-GBP\-terminal free acids.