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Acta Cryst. (2014). E70, o62-o63  [ doi:10.1107/S1600536813032996 ]


N. Kaewmanee, S. Chantrapromma, N. Boonnak, C. K. Quah and H.-K. Fun

Abstract: There are two independent mol­ecules in the asymmetric unit of the title compound, C16H17NO4, with similar conformations but some differences in their bond angles. Each mol­ecule adopts a trans configuration with respect to the methyl­idene C=N bond and is twisted with a dihedral angle between the two substituted benzene rings of 80.52 (7)° in one mol­ecule and 83.53 (7)° in the other. All meth­oxy groups are approximately coplanar with the attached benzene rings, with Cmeth­yl-O-C-C torsion angles ranging from -6.7 (2) to 5.07 (19)°. In the crystal, independent mol­ecules are linked together by O-H...N and O-H...O hydrogen bonds and a [pi]-[pi] inter­action [centroid-centroid distance of 3.6030 (9) Å], forming a dimer. The dimers are further linked by weak C-H...O inter­actions and another [pi]-[pi] inter­action [centroid-centroid distance of 3.9452 (9) Å] into layers lying parallel to the ab plane.

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