(3aR*,8bR*)-3a,8b-Dihy­droxy-1-(4-methyl­phen­yl)-2-methyl­sulfanyl-3-nitro-1,8b-di­hydro­indeno­[1,2-b]pyrrol-4(3aH)-one

The asymmetric unit of the title compound, C(19)H(16)N(2)O(5)S, 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—H⋯O inter­action is observed in mol­ecules B and C. The two hy­droxy groups in each mol­ecule are involved in inter­molecular O—H⋯O hydrogen bonding. In the crystal, mol­ecules are connected via O—H⋯O and C—H⋯O hydrogen bonds, forming a complex three-dimensional network.