Diisobutyl 4-(3-eth­oxy-4-hy­droxy­phen­yl)-2,6-dimethyl-1,4-dihydro­pyridine-3,5-dicarboxyl­ate

The asymmetric unit of the title compound, C25H35NO6, contains two independent mol­ecules. In each mol­ecule, the 1,4-dihydro­pyridine ring adopts a flattened boat conformation. The dihedral angles between the 1,4-dihydro­pyridine and benzene rings are 87.55 (7) and 87.23 (7)°. In one of these mol­ecules, one of the isobutyl groups is disordered over two sets of sites, with an occupancy ratio of 0.890 (2):0.110 (2). In the crystal, mol­ecules are linked through N—H⋯O, O—H⋯O and C—H⋯O hydrogen bonds forming two-dimensional networks parallel to the ab plane. The crystal structure is further stabilized by weak C—H⋯π inter­actions

1,1′-[4-(4-Methoxy­phen­yl)-2,6-dimethyl-1,4-dihydro­pyridine-3,5-di­yl]diethanone

In the title compound, C18H21NO3, which belongs to the family of calcium channel blockers, the dihydropyridine ring assumes a flattened boat conformation. The two carbonyl units adopt a synperiplanar conformation with respect to the double bonds in the dihydro­pyridine ring. The methoxy­phenyl ring is almost perpendicular to the prydine ring [dihedral angle = 89.01 (7)°]. In the crystal, the mol­ecules are connected by inter­molecular N—H⋯O hydrogen bonds

7-Chloro-3,3-dimethyl-9-phenyl-1,2,3,4-tetra­hydro­acridin-1-one

In the title salt, C21H18ClNO, the quinoline ring system is approximately planar [maximum deviation = 0.035 (2) Å], and forms a dihedral angle of 71.42 (6)° with the attached phenyl ring. The cyclo­hexa­none ring exists in a half-boat conformation. In the crystal packing, C—H⋯O contacts link the mol­ecules into extended supra­molecular chains along the c axis

Dimethyl 4-(4-ethoxy­phen­yl)-2,6-dimethyl-1,4-dihydro­pyridine-3,5-dicarboxyl­ate

In the title mol­ecule, C19H23NO5, the dihedral angle formed by the benzene ring and the planar part of the dihydro­pyridine ring is 83.52 (5)°. The dihydro­pyridine ring adopts a flattened boat conformation. In the crystal, mol­ecules are linked by N—H⋯O hydrogen bonds, generating chains running parallel to [100]. The crystal structure is consolidated by C—H⋯O contacts

Diammonium 1,1′,3,3′-tetra­methyl-2,2′,4,4′,6,6′-hexa­oxoperhydro-5,5′-bipyrimidine-5,5′-diide monohydrate

In the title hydrated salt, 2NH4 +·C12H12N4O6 2−·H2O, the two hexa­hydro­pyrimidine rings in the dianion are inclined to one another at a dihedral angle of 62.76 (5)°. In the crystal structure, the anions and water mol­ecules are linked into sheets parallel to the bc plane by inter­molecular O—H⋯O hydrogen bonds and sustained by C—H⋯O contacts. The linking of the anions and water mol­ecules with the cations by N—H⋯O hydrogen bonds creates a three-dimensional extended network. The crystal structure is further stabilized by very weak C—H⋯π inter­actions

Diethyl 2,6-dimethyl-4-p-tolyl-1,4-dihydro­pyridine-3,5-dicarboxyl­ate

In the title compound, C20H25NO4, the 1,4-dihydro­pyridine ring adopts a flattened-boat conformation and forms a dihedral angle of 89.77 (8)° with the benzene ring. Inter­molecular N—H⋯O hydrogen bonds result in the formation of extended chains parallel to the b axis

Dimethyl 1,4-dihydro-4-(4-methoxy­phen­yl)-2,6-dimethyl­pyridine-3,5-dicarboxyl­ate

In the title compound, C18H21NO5, the dihydro­pyridine ring adopts a flattened-boat conformation and its planar part forms a dihedral angle of 84.60 (2)° with the benzene ring. In the crystal, inter­molecular N—H⋯O and C—H⋯O hydrogen bonds result in the formation of zigzag layers parallel to (001). These layers are inter­connected via C—H⋯π inter­actions

3-Hy­droxy-2-[(2-hy­droxy-4,4-dimethyl-6-oxocyclo­hex-1-en-1-yl)(3-nitro­phen­yl)meth­yl]-5,5-dimethyl­cyclo­hex-2-en-1-one

Each of the cyclohexenone rings in the title compound, C23H27NO6, adopts a half-chair (envelope) conformation with the C atom carrying the methyl groups lying out of the plane defined by the five remaining C atoms; the O atoms lie to the same side of the mol­ecule as the respective >C(CH3)2 atoms. The hy­droxy and carbonyl O atoms face each other and are orientated to allow for the formation of two intra­molecular O—H⋯O hydrogen bonds. In the crystal, the presence of C—H⋯O contacts leads to the formation of supra­molecular chains along the b axis. These aggregate into layers that stack along c

1-(6-Chloro-2-methyl-4-phenyl-3-quinol­yl)ethanone

In the title compound, C18H14ClNO, the quinoline ring system is approximately planar with a maximum devation of 0.022 (1) Å and forms a dihedral angle of 62.70 (3)° with the phenyl ring. In the crystal, pairs of C—H⋯O inter­molecular hydrogen bonds link neighbouring mol­ecules into inversion dimers, forming R 2 2(14) ring motifs. These inversion dimers are stacked along the b axis. The structure is further stabilized by C—H⋯π inter­actions