title: 2,2'-Diethoxy-4,4'-[(E,E)-hydrazine-diyl-idenebis(methanylylidene)]diphenol.
abstract: The complete molecule of the title compound, C(18)H(20)N(2)O(4), is generated by inversion symmetry. The conformation around the C=N bond is E. With the exception of the eth-oxy substituent, the mol-ecule is essentially planar with an r.m.s. deviation of 0.0455 Å. In the crystal, mol-ecules are linked by O-H⋯N hydrogen bonds into a two-dimensional supra-molecular network parallel to the bc plane.
authors.affiliation: Department of Chemistry, University of Malaya, 50603 Kuala Lumpur,  Malaysia.
authors.forename: Wisam Naji Atiyah
authors.initials: WN
authors.lastname: Al-Mehana
authors.forename: Rosiyah
authors.initials: R
authors.lastname: Yahya
authors.forename: Faridah
authors.initials: F
authors.lastname: Sonsudin
authors.forename: Ihsan Naji Atiyah
authors.initials: IN
authors.lastname: Al-Mehana
authors.forename: Kong Mun
authors.initials: KM
authors.lastname: Lo