organic compounds
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The asymmetric unit of the title compound, C19H16N2O5S, contains four independent molecules (A, B, C and D), with two molecules (B and D) displaying disorder in their methylsulfanyl groups [occupancy ratios of 0.797 (11):0.203 (11) and 0.85 (2):0.15 (2)]. The nitro groups are twisted slightly out of the planes of the 2-pyrroline rings to which they are bonded with dihedral angles of 10.17 (1), 8.01 (1), 9.44 (1) and 8.87 (1)° in molecules A, B, C and D, respectively. The 2-pyrroline rings are almost orthogonal to the attached tolyl rings, forming dihedral angles of 73.44 (1), 81.21 (1), 88.18 (8) and 73.94 (1)° for molecules A, B, C and D, respectively. A weak intramolecular O—HO interaction is observed in molecules B and C. The two hydroxy groups in each molecule are involved in intermolecular O—HO hydrogen bonding. In the crystal, molecules are connected via O—HO and C—HO hydrogen bonds, forming a complex three-dimensional network.