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  • Title: The peptide Z-Aib-Aib-Aib-L-Ala-OtBu.
    Author: Gessmann R, Brückner H, Petratos K.
    Journal: Acta Crystallogr C Struct Chem; 2014 Apr; 70(Pt 4):405-7. PubMed ID: 24705058.
    Abstract:
    The title peptide, N-benzyloxycarbonyl-α-aminoisobutyryl-α-aminoisobutyryl-α-aminoisobutyryl-L-alanine tert-butyl ester or Z-Aib-Aib-Aib-L-Ala-OtBu (Aib is α-aminoisobutyric acid, Z is benzyloxycarbonyl and OtBu indicates the tert-butyl ester), C27H42N4O7, is a left-handed helix with a right-handed conformation in the fourth residue, which is the only chiral residue. There are two 4→1 intramolecular hydrogen bonds in the structure. In the lattice, molecules are hydrogen bonded to form columns along the c axis.
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