meso-N,N'-oxalyldivaline.
The title compound, 2,2'-(oxalyldiimino)bis(3-methylbutanoic acid), C12H20N2O6, possesses a centre of symmetry. In the crystal, molecules are connected by hydrogen bonds between oxamide and carboxyl groups, similar to the pattern of the monoclinic forms of HO-Gly-CO-CO-Gly-OH and HO-Aib-CO-CO-Aib-OH (Gly is glycine and Aib is 2-aminoisobutyric acid). The characteristic torsion angles in the title compound are close to those in peptide alpha-helices.
Perić
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B
Rudjer Bosković Institute, PO Box 180, HR-10002 Zagreb, Croatia. bperic@rudjer.irb.hr
Kojić-Prodić
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B
Makarević
J
J
Jokić
M
M
Zinić
M
M