organic compounds
Open access
The anti-inflammatory and cytoprotective tricyclic title compound, C21H18N2O2, also known as TBE-31, crystallizes with two nearly superimposable molecules in the asymmetric unit. In both molecules, the three ring systems conform to an envelope–chair–planar arrangement. The central ring, in a cyclohexane chair conformation, contains an axial ethynyl group that bends slightly off from a nearby axial methyl group because of the 1,3-diaxial repulsion between the two groups. In the crystal, weak C—HN and C—HO interactions form chains along [001].
organic compounds
Open access
In the title compound, C17H13NO2, two molecules crystallize in the asymmetric unit. The dihedral angle between the mean planes of the quinoline and benzene rings are 78.3 (4) and 88.2 (3)°. The carboxylate group is twisted slightly from the quinoline ring by 7.1 (2) and 13.3 (4)°, respectively. In the crystal, weak C—HO interactions are observed. Further stabilization is provided by weak π–π stacking interactions, with centroid–centroid distances of 3.564 (9)/3.689 (2) and 3.830 (1)/3.896 (5)Å, respectively.