Diethyl (E)-2,3-bis­[(E)-(2-methyl-2-phenyl­hydrazin-1-yl­idene)meth­yl]but-2-enedioate

The complete mol­ecule of the title compound, C₂₄H₂₈N₄O₄, is generated by crystallographic inversion symmetry. The ethyl side chain is disordered over two sets of sites in a 0.57 (4):0.43 (4) ratio. The dihedral angles between the methyl­idene group and the phenyl ring and ester side chain (major conformation) are 7.61 (8) and 86.95 (8)°, respectively. In the crystal, mol­ecules are linked via C—H...O hydrogen bonds, forming corrugated sheets lying parallel to (010).