Acta Cryst. (2013). E69, o660 [ doi:10.1107/S1600536813008490 ]
Abstract: In the title compound, C10H19N3O4, the N- and C-termini are protonated and ionized, respectively, and the molecule forms a zwitterion. The main chain is in a folded form. In the crystal, the N-terminal -NH3+ group hydrogen bonds to three C-terminal -COO groups and one carbonyl O atom, forming a three-dimensional network. In addition, an N-HO hydrogen bond between the amide groups of the middle glycine residue and a C-HO interaction continue along the a-axis direction. The side chains of the leucyl residues form a hydrophobic region along the a axis.
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