In the title compound, C(16)H(20)N(2)O(4), the mol-ecule features a zigzag -CH(2)-NH-CH(2)-CH(2)-NH-CH(2)- chain whose ends are connected to the hydroxy-phenyl rings. The mol-ecules lies about a center of inversion. The imino group is a hydrogen-bond donor for the hydr-oxy group, which is a hydrogen-bond donor for the imino group of an adjacent mol-ecule. This latter inter-molecular hydrogen bonding leads to a layer structure.