meso-3,6-Dioxopiperazine-2,5-diacet-amide.
The title compound, C(8)H(12)N(4)O(4), was obtained by cyclization of the two l-asparagine mol-ecules and reveals a crystallographic inversion symmetry, and accordingly the two stereogenic centres are of opposite chirality. Thus, an asymmetric unit comprises a half of a mol-ecule. The mol-ecules are assembled into a three-dimensional hydrogen-bonding network by N-H⋯O hydrogen bonds.
Center of Applied Solid State Chemistry Research, Ningbo University, Ningbo, Zhejiang 315211,  People's Republic of China.
Ping
P
Li
Chun
C
Zhang
Wei
W
Xu