title: (E)-3,4,5-Trimeth-oxy-N'-[(6-meth-oxy-4-oxo-4H-chromen-3-yl)methyl-idene]benzohydrazide monohydrate.
abstract: In the title chromone-tethered benzohydrazide derivative, C21H20N2O7·H2O, the atoms of the 4H-chromen-4-one segment are essentially coplanar (r.m.s. deviation = 0.0073 Å) with the largest deviation from the mean plane [0.012 (3) Å] being found for the benzene C atom. The dihedral angles between the chromone segment and the hydrazide plane and between the chromone segment and the benzene ring of the tri-meth-oxy-benzene unit are 24.67 (9) and 41.28 (8) Å, respectively. The mol-ecule is connected to the solvent water mol-ecule by O-H⋯O hydrogen bonds and weak C-H⋯O inter-actions. Additional N-H⋯O inter-actions are observed and together they link the mol-ecules into chains forming a two-dimensional network along (011).
authors.affiliation: School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka 422-8526, Japan.
authors.forename: Yoshinobu
authors.initials: Y
authors.lastname: Ishikawa
authors.affiliation: School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka 422-8526, Japan.
authors.forename: Kohzoh
authors.initials: K
authors.lastname: Watanabe
keywords: crystal structure