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The asymmetric unit of the title compound, 2C18H12O4·C2H6OS·2H2O, consists of four crystallographically independent mol­ecules of 5-(naphthalen-1-yl)isophthalic acid, two dimethyl sulfoxide and four water mol­ecules. The dihedral angles formed by the the planes of the aromatic fragments of the organic mol­ecules range from 57.4 (1) to 59.1 (1)°. In the crystal, multiple O—H...O hydrogen bonds link the water mol­ecules with the carbonyl and sulfoxide groups, giving rise to double ribbons along the b-axis direction.

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In the title compound, C15H11N, the mean planes of the aromatic moieties are inclined to one another by 72.9 (1)°. The crystal is stabilized by π–π stacking inter­actions between the pyridine rings of inversion-related mol­ecules, with a centroid–centroid distance of 3.772 (2) Å. In addition, C—H...π contacts involving an α-C—H group of the pyridine ring and the nonsubstituted ring of the naphthalene unit are observed, giving rise to a herringbone-type supramolecular architecture of the naphthalene moiety being contained in the molecule.
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