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The title compound, C20H17NO6, was synthesized by the reaction of syringaldehyde with hippuric acid. The molecule adopts a Z configuration about the central olefinic bond. The two benzene rings and the oxazolone ring are almost coplanar. The crystal structure is stabilized by weak intermolecular C—H...O hydrogen bonds. [ABSTRACT FROM AUTHOR]

The title compound, C19H22N2O7·H2O, was synthesized as part of a continuing project involving the structures of hydrazone derivatives. The molecules pack in a three-dimensional framework structure by a combination of O—H...O, O—H...N and N—H...O hydrogen bonds. [ABSTRACT FROM AUTHOR]

Molecules of the title compound, C19H16N4O2·H2O, are linked into a one-dimensional ladder structure by a combination of intermolecular O—H...O and N—H...O hydrogen bonds. [ABSTRACT FROM AUTHOR]

In the title compound, C22H18N4O4·2H2O, the hydrazine molecule lies across a twofold rotation axis, the mean planes of the two quinoline ring systems forming a dihedral angle of 64.1 (2)°. The hydrazine molecules and two water molecules are linked into infinite chains by O—H⋯O, O—H⋯N and N—H⋯O hydrogen bonds. [ABSTRACT FROM AUTHOR]

The title compound, C20H19N3O3·1.5H2O, has two organic mol­ecules in the asymmetric unit which differ in conformation. The two independent mol­ecules and three water mol­ecules are linked into layers by O—H⋯O, O—H⋯N and N—H⋯O hydrogen bonds. [ABSTRACT FROM AUTHOR]

In the title compound, C23H28O6, the mean planes of the two benzene rings make a dihedral angle of 81.1 (2)°. A twofold rotation axis passes through the central C atom. The molecules are connected into chains via intermolecular O—H...O hydrogen bonds. [ABSTRACT FROM AUTHOR]