N-(Di­cyclo­propyl­methylamino)-4,5-di­hydro-1,3-oxazolium dihydrogenphosphate

The title compound, C₁₀H₁₇N₂O⁺·H₂PO₄⁻, consists of a rilmenidine cation and a phosphate anion. In the solid state, the inversion-related phosphate anions are linked by O—H...O hydrogen bonds to form a chain along the a axis. The cations are connected to the chain via N—H...O hydrogen bonds.

4-p-Tolyl-1,3,4,4a,5,6,7,8a-octa­hydro-2H-pyrano­[2,3-d]­pyrimidin-2-one

The title compound, C₁₄H₁₈N₂O₂, which was obtained from an extended Biginelli reaction, contains a pyran ring with a chair conformation, a pyrimidine ring with a half-chair conformation and a benzene ring. The crystal structure is stabilized by an intermolecular hydrogen-bond network involving both NH groups and the carbonyl group.

9-Butyl-3,4,5,6,7,9-hexa­hydro-2H-xanthene-1,8-dione

The title compound, C₁₇H₂₂O₃, which was synthesized by the condensation of cyclo­hexane-1,3-dione and n-valer­aldehyde, includes a partially hydrogenated xanthene ring system. The mol­ecule has crystallographic mirror symmetry. The central ring adopts a very shallow boat conformation while the symmetry-related outer six-membered rings have sofa conformations. Molecules form extended tapes in the c-axis direction though weak C—H...O interactions.

4-(o-Methoxy­phenyl)-1,3,4,4a,5,6,7,8a-octa­hydro-2H-pyrano­[2,3-d]­pyrimidine-2-thione

The title compound, C₁₄H₁₈N₂O₂S, which was obtained from an extended Biginelli reaction, contains a pyran ring with a chair conformation, a pyrimidine ring with a half-chair conformation and a benzene ring. The crystal structure is stabilized by an intermolecular hydrogen-bond network.

6α-Hydr­oxy-12-oleanen-3-one: a triterpenoid from the stalks of Celastrus hypoleucus

The title compound, C₃₀H₄₈O₂, is a triterpenoid which was isolated from the stalks of Celastrus hypoleucus (Oliv.) Warb. The mol­ecule contains five six-membered rings adopting distorted boat, half-chair and chair conformations. The hydr­oxy groups serve as hydrogen-bond donors and the carb­onyl groups as acceptors, forming mol­ecular chains parallel to the b axis.