The title compound, C(22)H(30)O(7), is a fused five-ring system that is of inter-est for its anti-cancer and anti-malarial activity. The six-membered C(6) and C(5)O rings display chair conformations. The six-membered C(3)O(3) ring containing the ether and per-oxy functionalities has a distorted boat conformation, with a C-O-O-C torsion angle of 42.6 (1)° for the per-oxy group. The seven-membere...

The title compound, C(26)H(32)BrNO, the ring with the amide unit possesses a chair conformation with the two methyl groups in axial positions..

In the title compound, C(25)H(26)O(2), the dioxane ring adopts a chair conformation with the two substituent groups occupying equatorial positions.

In the title compound, C(20)H(24)FNO(3)S, the piperidine ring adopts a chair conformation. The dihedral angle between the aromatic rings is 47.01 (17)°.

In the title compound, C(11)H(18)O(5)S(2), the six- and five-membered rings adopt a chair and an approximately planar conformation, respectively.

In the title compound, C(37)H(34)N(2)O(4)S, the piperidine ring adopts a half-chair conformation. The thia-zole ring adopts a slightly twisted envelope conformation and the pyrrole ring adopts an envelope conformation; in each case, the C atom linking the rings is the flap atom. An intra-molecular C-H⋯O inter-action is noted. The crystal structure is stabilized by C-H⋯O and C-H⋯π inter-actions.

In the biologically active title compound, C26H26O5, the pyran ring of the chromene unit adopts a half-chair conformation. The C=C double bond of the propenone unit exhibits a trans conformation and the carbonyl group is syn conformation to the double bond. The dihedral angle between the benzene ring and the benzopyran-one moiety is 31.54 (4)°. The mol-ecular structure is stabilized by an intra...

In the title compound, C(35)H(30)N(2)O(5)Se, the pyrrolidine ring adopts an envelope conformation and the oxazolidine ring is in a twist conformation. The tetra-hydro-pyran ring adopts a half-chair conformation. The methoxy-phenyl ring is twisted away from the attached azetidinone ring by 15.7 (1)°. In the crystal structure, inter-molecular C-H⋯O inter-actions link the mol-ecules into a two-dim...

In the octa-hydroxanthenedione unit of the title compound, C31H27NO6, the central di-hydro-pyran ring shows an envelope conformation, while the bilateral cyclo-hexene and cyclo-hexane rings adopt a half-boat conformation and a chair conformation, respectively. The nitro-benzene ring is twisted with respect to the two benzene rings, making dihedral angles of 63.1 (1) and 63.0 (1)°. In the crysta...

In the title compound, C(24)H(28)N(2)O(4), the dioxalane ring has an envelope conformation. The cyclo-hexane ring adopts a chair conformation. The dihedral angle between the benzene rings is 72.5 (3)°. The mol-ecular conformation is stabilized by two intra-molecular O-H⋯N hydrogen-bonding inter-actions with an S(6) graph-set motif. The crystal structure is stabilized by van der Waals inter-acti...