Key indicators: single-crystal X-ray study; T = 296 K; mean (C-C) = 0.003 Å; R factor = 0.039; wR factor = 0.091; data-to-parameter ratio = 15.1.In the title compound, C 15 H 16 ClNO 2 S 2 , the 2H-chromene ring system is nearly planar, with a maximum deviation of 0.023 (2) Å . In the crystal, C-HÁ Á ÁO hydrogen bonds give R 2 1 (7) motifs, which generate [100] chains. C-HÁ Á Á andinteractions between chromene moieties [shortest ring centroid-centroid distance = 3.6199 (13) Å ] consolidate the packing. Related literature

In the title compound, C16H12O4, the chromene ring system is almost planar [maximum deviation = 0.026 (1) Å] and makes dihedral angles of 1.24 (9) and 26.5 (2)° with the fused benzene ring and the plane of the ethyl carboxyl­ate group, respectively.

In the title compound, C17H17N O4S, the quinoline ring system is nearly planar, with a maximum deviation of 0.0496 (16) Å. A weak intra­molecular C—H⋯O inter­action is observed. In the crystal, C—H⋯O, S—H⋯N and π–π stacking inter­actions between the fused benzene ring of quinoline and the pyridine moieties [shortest centroid–centroid distance = 3.6754 (11) Å] are observed. Inversion-related weak C—H⋯O inter­molecular inter­actions diagonally along [010], with R 2 2(10) ring motifs, and S—H⋯N inter­molecular inter­actions diagonally along [100], with R 2 2(8) ring motifs, are present, forming a three-dimensional network structure. No classical hydrogen bonds are observed.

In the title compound, C16H17NO3S2, the dihedral angles between the O/C/C/S group and the 2H-chromene ring system and the thio­carbamate group are 14.46 (9) and 83.30 (9)°, respectively. The bond-angle sum at the N atom is 360.0°. One of the methyl C atoms lies above the thio­carbamate plane and one lies below it [deviations = 1.264 (3) and −1.147 (3) Å, respectively]. In the crystal, inversion dimers linked by pairs of C—H⋯O hydrogen bonds generate R 2 2(10) loops. Weak aromatic π–π stacking inter­actions [shortest centroid–centroid distance = 3.8138 (11) Å] are also observed.

In the title compound, C17H19NO2S2, the 2H-chromene ring system is nearly planar, with a maximum deviation of 0.0383 (28) Å, and the piperidine ring adopts a chair conformation. The 2H-chromene ring makes dihedral angles of 32.89 (16) and 67.33 (8)°, respectively, with the mean planes of the piperidine ring and the carbodi­thio­ate group. In the crystal, C—H⋯O and weak C—H⋯S hydrogen bonds link the mol­ecules into chains along [001]. The crystal structure also features C—H⋯π and π–π inter­actions, with a centroid–centroid distance of 3.7097 (17) Å.