R. Puliti et al., STRUCTURE OF N-ACETYL-L-PROLYLGLYCINAMIDE, Acta crystallographica. Section C, Crystal structure communications, 49, 1993, pp. 2173-2176
In the crystal, two N-acetyl-L-prolylglycinamide molecules form the as
ymmetric unit and are linked as a dimer by two hydrogen bonds between
the N-H groups and amidic O atoms. Each molecule shares six hydrogen b
onds with three translated conformers. All the hydrogen bonds lie appr
oximately in planes, which separate the apolar regions. In both indepe
ndent molecules, the puckering of the proline rings can be described a
s slightly distorted C2-C(beta)-exo conformations.