In the title compound, C(22)H(18)O(3), an intra-molecular O-H⋯O hydrogen bond stabilizes the mol-ecular structure, forming an S(6) ring motif. The central benzene ring forms a dihedral angle of 64.74 (5)° with the phenyl ring and a dihedral angle of 5.58 (5)° with the terminal benzene ring. In the crystal, mol-ecules are linked into columns along the a axis via inter-molecular C-H⋯O hydrogen bo...

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...

In the title compound, C(20)H(21)N(3)O(4), the 1,4-dihydro-pyridine ring adopts a boat conformation. An intra-molecular C-H⋯O hydrogen bond generates an S(6) ring motif. The pyrazole ring makes dihedral angles of 87.81 (7) and 45.09 (7)° with the mean plane of the 1,4-dihydro-pyridine ring and the phenyl ring, respectively. In the crystal, mol-ecules are linked by N-H⋯N, N-H⋯O and C-H⋯O hydroge...

In F(o)F(1) (F(o)F(1)-ATP synthase), proton translocation through F(o) drives rotation of the oligomer ring of F(o)-c subunits (c-ring) relative to F(o)-a. Previous reports have indicated that a conserved arginine residue in F(o)-a plays a critical role in the proton transfer at the F(o)-a/c-ring interface. Indeed, we show in the present study that thermophilic F(o)F(1s) with substitution of th...

In the cation of the title mol-ecular salt, C13H20NO(+)·C7H5ClNO2 (-), the five-membered ring adopts a twisted conformation about one of the C-N bonds. The exocyclic N-C bond has an equatorial orientation. The dihedral angle between the five-membered ring (all atoms) and the benzene ring is 76.56 (19)°. In the anion, the dihedral angle between the carboxyl-ate group and the benzene ring is 18.5...

In the title compound, C(21)H(28)N(2)O(5) (systematic name: methyl 1,4a-dimethyl-7-nitro-9-oxo-6-propyl-amino-1,2,3,4,4a,9,10,10a-octa-hydro-phenanthrene-1-carboxyl-ate) the cyclo-hexane ring (A) and the central cyclo-hexene ring (B) exist at a trans ring junction, with the two methyl groups in the axial positions of the six-membered rings. Ring A has a chair conformation and ring B a half-chai...

The title compound, C(20)H(17)N(3)O(2)·CH(4)O·H(2)O, was synthesized by the condensation reaction of 2-benzyl-oxybenzaldehyde with isoniazid (isonicotinic acid hydrazide). The tricyclic compound displays a trans configuration with respect to the C=N double bond. The central benzene ring makes dihedral angles of 8.83 (7) and 70.39 (8)° with the pyridine ring and the terminal benzene ring, respec...

In the title compound, C(20)H(19)N(3)OS, the central benzene ring makes dihedral angles of 45.36 (9) and 55.33 (9)° with the thio-phene ring and the dimethyl-substituted benzene ring, respectively. The dihedral angle between the thio-phene ring and dimethyl-substituted benzene ring is 83.60 (9)°. The thio-phene ring and the benzene ring are twisted from the mean plane of the C(=O)-N-N=C bridge ...

In the title isoniazid derivative, C(13)H(11)N(3)O(4)·2H(2)O, the Schiff base mol-ecule exists in an E configuration with respect to the acyclic C=N bond. An intra-molecular O-H⋯N hydrogen bond forms a six-membered ring, producing an S(6) ring motif. The essentially planar pyridine ring [maximum deviation = 0.0119 (8) Å] is inclined at a dihedral angle of 7.30 (4)° with respect to the benzene r...