The peptide antibiotic P168 contained a new amino acid, (2S,4S)-2-amino-6-hydroxy-4-methyl-8-oxodecanoic acid (6) and an amine, (S)-N1,N1-dimethylpropane-1,2-diamine (4) along with other unusual amino acids. The structure of the peptide was determined as (I) by in-beam mass spectrometry.
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Isogai et al. (1984) studied this question.
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