In the title compound, C(18)H(21)NO(3), the 1,4-dihydro-pyridine ring exhibits a flattened boat conformation. The methoxy-phenyl ring is nearly planar [r.m.s. deviation = 0.0723 (1) Å] and is perpendicular to the base of the boat [dihedral angle = 88.98 (4)°]. Inter-molecular N-H⋯O and C-H⋯O hydrogen bonds exist in the crystal structure.

In the crystal structure of the title compound, C(28)H(36)O(4)S, the p-tolyl ring is inclined at 35.8° to the aromatic ring. The cyclohexene ring adopts a boat conformation and the heterocyclic ring is in a slightly distorted screw boat conformation.

In the title compound, C10H14BrNO3, the six-membered lactone ring is in a boat conformation, with the two carbonyl groups cis to one another across the boat basal plane. C-H...O hydrogen bonds and weak C-H...Br interactions stabilize the crystal structure.

Today, researchers exploit hybrid craft more than they used to be. The main reason is that they need to high speed as well as extra portability. For instance, a famous hybrid craft is named Hysucat, was designed through the combination of catamaran and hydrofoil. Catamarans, a type of multihull boats, have always considered by designers because of their simultaneous supply of high speed and sta...

In the title compound, C31H30N2O, the cis-fused cyclo-hexene and cyclo-octane rings adopt boat and boat-chair conformations, respectively. The essentially planar five-membered N-heterocyclic ring [r.m.s. deviation = 0.017 (1) Å] is cis- and trans-fused, respectively, with the cyclo-hexene and cyclo-octane rings. In the crystal, mol-ecules are linked into inversion dimers through pairs of weak C...

In the cation of the title salt, C23H27N2O4 (+)·C2HO4 (-)·2H2O, both fused pyrrolidine rings exhibit twisted conformations, while the piperidine rings adopt screw-boat and boat conformations. In the crystal, the three components are linked via O-H⋯O and N-H⋯O inter-actions, forming a tape along the b axis. The tapes are further linked by weak C-H⋯O hydrogen bonds. forming a three-dimensional ne...