title: Diethyl 2,2'-bis-(hy-droxy-imino)-3,3'-(hydrazinediyl-idene)dibutano-ate.
abstract: Each mol-ecule of the title compound, C(12)H(18)N(4)O(6), is located on an inversion centre at the mid-point of the central N-N bond. The azo groups C=N of the Schiff base group have an E conformation and the azo groups in the oxime C=N-O groups have a Z conformation. O-H⋯O hydrogen bonds link neighbouring mol-ecules into infinite monolayers perpendicular to the a axis.
authors.forename: Hui
authors.initials: H
authors.lastname: Li
authors.forename: Peng-Fei
authors.initials: PF
authors.lastname: Su
authors.forename: Jun-Feng
authors.initials: JF
authors.lastname: Tong
authors.forename: Bo-Zhou
authors.initials: BZ
authors.lastname: Wang