In the title compound, C(23)H(25)NO, an intra-molecular O-H⋯N hydrogen bond defines the mol-ecular conformation; the naphthol mean plane and the benzene ring form a dihedral angle of 75.8 (2)°. The piperidine ring adopts a chair conformation. The crystal packing exhibits no short inter-molecular contacts.

The seven-membered ring of the title compound, C(17)H(20)N(2)O(2), adopts an approximate boat conformation while the cyclo-hexyl ring adopts a chair conformation. In the crystal, adjacent mol-ecules are linked by N-H⋯O hydrogen bonds into a zigzag chain running along the c axis of the monoclinic unit cell.

The oxazole ring in the title compound, C(20)H(23)NO(3), adopts an envelope conformation while the 12-membered ring is in a chair conformation. The dihedral angle between the benzene rings is 37.8 (1)°. The crystal structure displays inter-molecular C-H⋯O hydrogen bonding.

In the title compound, C(13)H(16)N(4)OS(3), a thienopyridine-derivative, the tetra-hydro-pyridine ring exhibits a half-chair conformation, and the folded conformation of the mol-ecule is defined by the N-C-C-N torsion angle of -78.85 (16)°. The crystal packing features inter-molecular C-H⋯N, N-H⋯N and C-H⋯O hydrogen bonds.

The thia-zolidine ring and the pyrrolidine ring in the title compound, C(25)H(26)N(2)O(2)S, both adopt an envelope conformation. The seven-membered ring has a twist-chair conformation. The crystal packing is stabilized by inter-molecular N-H⋯O hydrogen bonds.

In the title mol-ecule, C(28)H(30)N(2)O(2), the piperazine ring adopts a chair conformation and the C=C bond exhibits an E conformation. The dihedral angle between the terminal phenyl rings is 71.4 (2). In the crystal, mol-ecules are linked by C-H⋯O hydrogen bonds, forming [010] chains.

In the title compound, C(18)H(23)ClN(3)O(3), the imidazole ring system has an envelope conformation, whereas the nitronyl nitroxide unit displays a half-chair or twisted conformation. In the crystal, C-H⋯O hydrogen bonds build up a three-dimensional network.

In the title compound, C(26)H(31)NO(6)S, the five-membered pyrrolidine ring adopts an envelope conformation and the six-membered thia-zine ring is in a distorted chair conformation. The crystal packing is stabilized through an inter-molecular C-H⋯O inter-action, generating inversion-related R(2) (2)(10) ring motifs.

In the title compound, C(30)H(34)N(2)O(3)·C(2)H(6)O, the piperazine ring adopts a chair conformation and the ethene bond exhibits an E conformation. In the crystal, the two components are linked by an O-H⋯O hydrogen bond.

In the title compound, C(25)H(25)NO(4), the pyrrolidine ring exhibits an envelope conformation and the tetra-hydro-pyran ring exhibits a half-chair conformation. The crystal structure is stabilized by inter-molecular C-H⋯π inter-actions.