Date Published: August 01, 2012
Publisher: International Union of Crystallography
Author(s): Xin Zhu, Qiujuan Ma.
The title compound, C11H12N2O6, crystallizes with two independent molecules in the asymmetric unit, which differ slightly in conformation. The dihedral angle between the amide O=C—N plane and the attached benzene ring is 19.5 (3)° in one molecule and 23.4 (3)° in the other. In the crystal, the two independent molecules are connected alternately by N—H⋯O hydrogen bonds, forming a chain along the a axis.
For the biological activity of compounds with nitro and ester groups, see: Sykes et al. (1999 ▶). For a related structure, see: Wu et al. (2011 ▶).