title: 1-(2-Hydr-oxy-5-methoxy-phen-yl)ethan-1-one N-[(E)-1-(2-hydr-oxy-5-methoxy-phen-yl)ethyl-idene]hydrazone.
abstract: In the title mol-ecule, C(18)H(20)N(2)O(4), which resides on a crystallographic centre of inversion (at the centre of the N-N bond), all non-H atoms apart from the meth-oxy substituent are approximately coplanar. The structure displays intra-molecular O-H⋯N hydrogen bonding.
authors.forename: Jin-Hua
authors.initials: JH
authors.lastname: Zhang
authors.forename: Wen-Liang
authors.initials: WL
authors.lastname: Dong
authors.forename: Yan-Qing
authors.initials: YQ
authors.lastname: Ge
authors.forename: Bao-Xiang
authors.initials: BX
authors.lastname: Zhao