In the title compound, C15H22O2, both five-membered rings display an envelope conformation whereas the six-membered ring displays a chair conformation. In the crystal, pairs of O-H⋯O hydrogen bonds between carb-oxy-lic groups link mol-ecules, related by a twofold rotation axis, into supra-molecular dimers.

In the mol-ecule of the title compound, C(15)H(15)NO(4)S, the two six-membered rings are almost parallel to each other [dihedral angle = 1.87 (9)°] and perpendicular to the mean plane through the five-membered ring [dihedral angles of 89.98 (10) and 89.04 (10)°]. The crystal structure is stabilized by inter-molecular C-H⋯O hydrogen-bonding inter-actions.

In the title compound, C(20)H(29)NO(8)S, the two five-membered rings adopt envelope conformations (with an O atom at the flap in each case), while the six-membered pyran ring displays a twist-boat conformation. In the crystal, mol-ecules are linked by N-H⋯O hydrogen bonds into a supra-molecular chain running along the a axis.

In the title compound, C7H5BrN2, fused six-membered pyridine and five-membered pyrrole rings form the essentially planar aza-indole skeleton (r.m.s. deviation = 0.017 Å). In the crystal, pairs of N-H⋯N hydrogen bonds connect the mol-ecules into inversion dimers.

In the title compound, C(15)H(22)O(3), the five-membered ring displays an envelope conformation, whereas the two six-membered rings show different conformations, viz. chair and half-chair. In the crystal, mol-ecules are linked through inter-molecular O-H⋯O hydrogen bonds, forming chains running along the b axis.

In the square-pyramidal title complex, [CuCl(C(17)H(24)N(4)O)]Cl, the Cu(II) atom is coordinated by three N atoms [Cu-N 1.946 (2), 2.010 (2), 2.085 (3) Å], one O atom [Cu-O 1.910 (2) Å] and one apical Cl atom [Cu-Cl 2.6437 (9) Å]. The three coordinated N and one O atom are almost coplanar, with a maximum deviation of 0.0268 Å. The tetra-dentate ligand forms two five-membered (N-Cu-N) and one si...

The mol-ecule of the title compound, C18H13NOS, is build up from two fused six-membered rings, with the heterocyclic component linked to a benzyl-idene group and to a prop-2-yn-1-yl chain. The six-membered heterocycle adopts a distorted screw-boat conformation. The prop-2-yn-1-yl chain is almost perpendicular to the mean plane through benzo-thia-zine as indicated by the C-N-C-C torsion angle of...

The title compound, C30H44O3 [systematic name: 6aR,6 bR,8aS,9aR,12aR,14bR)-4,4,6a,6;b,8a,14b-hexa-methyl-12-methyl-eneicosa-hydro-3H-phenanthro[1',2':6,7]indeno-[2,1-b]furan-3,11(2H)-dione], is a triterpene lactone, which was isolated from di-chloro-methane extract of Elaeodendron trichotomum (Turcz.) Lundell (celastraceae) stem bark. The compound has a lupane skeleton and consists of four fuse...

The structure analysis of the title compound, C(14)H(16)O(2)S(2), shows the SMe and H atoms of the bond linking the six-membered rings to be syn and also to be syn to the bridgehead -CH(2)- group. Each of the five-membered rings adopts an envelope conformation at the bridgehead -CH(2)- group. The dione-substituted ring adopts a folded conformation about the 1,4-C⋯C vector, with the ketone group...

The title compound, C(20)H(20)Br(2)N(4)O(7), is an inter-mediate for mol-ecular clips. The seven- and six-membered rings have chair conformations, while the five-membered rings adopt envelope conformations. In the crystal structure, weak C-H⋯O and C-H⋯Br inter-actions link the mol-ecules into a three-dimensional network. The eth-oxy and ethyl groups are disordered over two orientations, with oc...