In the title compound, C(18)H(16)N(2)O(2)·H(2)O, the dihedral angle between the quinoline ring system and the benzene ring is 87.19 (8)°. In the crystal, water mol-ecules are linked to acetamide mol-ecules via inter-molecular O-H⋯N and O-H⋯O hydrogen bonds.

The title compound, C(18)H(20)N(2)O(2), crystallizes with two mol-ecules in the asymmetric unit. The morpholine rings of both mol-ecules adopt chair conformations. The crystal structure is stabilized by inter-molecular N-H⋯O hydrogen bonds. One phenyl ring is disordered over two orientations in a 0.665 (5):0.335 (5) ratio.

The title thio-urea mol-ecule, C(13)H(18)N(2)OS, adopts a folded conformation due to the steric hindrance of the two ethyl groups and the acetyl group. In the crystal structure, the acetyl O atom is not involved in hydrogen bonding, but inter-molecular N-H⋯S hydrogen bonds link the mol-ecules into centrosymmetric dimers.

In the title compound, C(18)H(22)ClNO(5), the cyclo-hexene ring adopts a distorted half-chair conformation. The mol-ecular structure is stabilized by pairs of intra-molecular N-H⋯O and O-H⋯O inter-actions, generating S(6) motifs. In the crystal, the mol-ecules are linked by inter-molecular C-H⋯O inter-actions, forming centrosymmetric dimers.

In the title mol-ecule, C(13)H(19)NO(3)S, the S atom has a distorted tetra-hedral geometry with an O-S-O bond angle of 120.39 (18)°. The cyclo-hexane ring has a chair conformation. In the crystal, mol-ecules are connected by inter-molecular N-H⋯O hydrogen bonds, forming zigzag hydrogen-bonded chains directed along the c axis.

In the title mol-ecule, C(18)H(16)F(2)O(4), the two benzene rings form a dihedral angle of 55.2 (2)°. In the crystal structure, weak inter-molecular C-H⋯O hydrogen bonds link the mol-ecules into chains propagating along the c axis.

The asymmetric unit of the title compound, C(20)H(18)N(4)S(4), contains one half-mol-ecule situated on a twofold rotation axis, in which the thia-diazole and phenyl rings are twisted by 7.2 (3)°. In the crystal, weak inter-molecular C-H⋯π inter-actions link the mol-ecules into layers parallel to (103).

In the title compound, C(18)H(22)N(2)O(4), the dihedral angle between the pyrrolyl and quinolinyl fragments is 68.97 (2)°. Two non-classical intra-molecular C-H⋯O hydrogen bonds stabilize the mol-ecular geometry. In the crystal structure, mol-ecules form infinite chains via moderate inter-molecular N-H⋯O(CH(3)) hydrogen bonds.

The title compound, C(18)H(23)NO(3), the adamantane derivative of norcantharidin, which is itself derived from cantharidin, crystallized with three independent mol-ecules in the asymmetric unit. In the crystal, mol-ecules are linked by inter-molecular C-H⋯O inter-actions, leading to the formation of a supra-molecular two-dimensional network.

In the title mol-ecule, C(18)H(17)N(3)O(3), the dihedral angle between the mean planes of the furan ring and the quinoline group is 77.4 (2)°. In the crystal structure, inter-molecular N-H⋯N hydrogen bonds link the mol-ecules into centrosymmetric dimers.