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Key indicators: single-crystal X-ray study; T = 296 K; mean (C-C) = 0.006 Å; disorder in main residue; R factor = 0.104; wR factor = 0.316; data-to-parameter ratio = 12.2.The title compound, C 31 H 27 F 3 O 7 , is a liquid crystal and exhibits enantiotropic SmA and nematic phase transitions. In the crystal, the the 2H-chromene ring system makes dihedral angles of 54.46 (17) and 7.79 (16) , respectively, with the central benzene ring and 4-(heptyloxy)benzene ring. The three F atoms of the -CF 3 group are disordered over two sets of sites, with an occupancy ratio of 0.62 (3):0.38 (3). The crystal structre features two pairs of C-HÁ Á ÁO hydrogen bonds, which form inversion dimers and generate R 2 2 (10) and R 2 2 (30) ring patterns. C-HÁ Á ÁO interactions along [100] and C-HÁ Á Á interactions futher consolidate the packing, leading to a three-dimensional network. Related literature

In the title compound, C15H15NO4S, the dihedral angle between the benzene rings is 78.62 (16)°. In the crystal, adjacent molecules are linked along the c axis into C(4) chains through strong N—H...O hydrogen bonds. Molecules are further connected through C—H...O hydrogen bonds into a hexameric unit generating an R66(66) motif. Another C—H...O interaction connects the molecules along the c axis, forming C(5) chains. A region of disordered electron density, most probably disordered methanol–water solvent molecules, was treated with the SQUEEZE routine in PLATON [Spek (2009). Acta Cryst. D65, 148–155]. The formula mass and unit-cell characteristics do not take into account this disordered solvent

In the title compound, C15H15NO4S, the dihedral angle between the aromatic rings is 80.81 (1)° and the dihedral angle between the planes defined by the S—N—C=O fragment and the sulfonyl benzene ring is 86.34 (1)°. In the extended structure, dimers related by a crystallographic twofold axis are connected by pairs of both N—H⋯O hydrogen bonds and C—H⋯O inter­actions, which generate R 2 2(8) and R 2 2(14) loops, respectively. A weak aromatic π–π stacking inter­action is also observed [centroid–centroid separation = 3.7305 (3) Å].

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