Crystal structure and Hirshfeld surface analysis of ethyl ()-4-[(4-hy-droxy-3-meth-oxy-5-nitro-benzyl-idene)amino]-benzoate.

The title Schiff base compound, CHNO, has an configuration with respect to the C=N bond, with a dihedral angle between the two benzene rings of 31.90 (12)°. There is an intra-molecular O-H⋯O hydrogen bond present forming an (6) ring motif. In the crystal, mol-ecules are linked by pairs of O-H⋯O hydrogen bonds, forming inversion dimers enclosing an (4) ring motif. The dimers are linked about an inversion centre by pairs of C-H⋯O hydrogen bonds, which enclose (22) loops, forming chains propagating along the [10] direction. Hirshfeld surface analysis and fingerprint plots show enrichment ratios for the H⋯H, O⋯H and C⋯H contacts, indicating a high propensity of such inter-actions in the crystal. Both the nitro group and the CH-CH-O- group are positionally disordered.