Acta Cryst. (2012). E68, o3417-o3418
[ doi:10.1107/S1600536812047307 ]
Abstract: The molecular structure of the title compound, C20H18N2O5S·C3H7NO, represents an essentially planar 5-benzylidene-thiazolidine moiety (r.m.s. deviation from planarity without ring substituents = 0.095 Å) to which the 4-aminobenzoic acid fragment is inclined at 76.23 (1)°. In the crystal, the benzoic acid molecules are arranged in layers parallel to  which are built up from inversion dimers held together by head-to-tail phenol-carboxy O-HO hydrogen bonds and head-to-tail - stacking interactions between the 5-benzylidene-thiazolidine moieties (ring centroid distance = 3.579 Å). These layers are separated by the dimethylformamide solvent molecules which are firmly anchored via a short O-HO hydrogen bond [OO = 2.5529 (10) Å] donated by the -COOH group.
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