3-(2-Amino-1-methyl-4-oxo-4,5-dihydro-1H-imidazol-5-yl)-3-hydr­oxy-1-phenyl­indolin-2-one ethanol solvate

In the title compound, C18H16N4O3·C2H5OH, mol­ecules are linked into chains by a series of inter­molecular N—H⋯O, N—H⋯N and O—H⋯O hydrogen bonds which stabilize the crystal structure. The indole and creatinine units make a dihedral angle of 56.45 (4)°. The title compound has two chiral centres. The crystal structure indicates the compound is racemic (RR and SS)

3-(2-Amino-1-methyl-4-oxo-4,5-dihydro-1H-imidazol-5-yl)-5-fluoro-3-hydr­oxy-1-methyl­indolin-2-one methanol hemisolvate

In the title compound, C13H13FN4O3·0.5CH3OH, mol­ecules are packed in the crystal structure by a series of O—H⋯N, N—H⋯O, N—H⋯F and O—H⋯O inter­molecular hydrogen bonds. The indole and creatinine units make a dihedral angle of 60.80 (4)°

(Z)-Methyl 4-({3-[(2,5-dioxoimidazolidin-4-yl­idene)meth­yl]-1H-indol-1-yl}meth­yl)benzoate

In the title compound, C21H17N3O4, pairs of mol­ecules form a planar[maximum deviation 0.0566 (9) Å] centrosymmetric imidazole dimer via two N—H⋯O hydrogen bonds. These dimeric units are linked by further N—H⋯O hydrogen bonds between the ester carbonyl group and the imidazolidine ring, formiing chains parallel to the c-axis direction. In addition, there are π–π stacking inter­actions between the planar imidazole pairs, with an inter­planar spacing of 3.301 (2) Å. There is a double bond with Z geometry connecting the imidazolidine and indole units

(E,E)-1-Methyl-2,6-distyrylpyridinium iodide

In the title compound, C22H20N+·I−, the dihedral angles between the central pyridine ring and two outer benzene rings are 15.30 (10) and 11.82 (11)°. There are inter­molecular π–π stacking inter­actions between the nearest phenyl ring over an inversion-related pyridyl ring, the shortest centroid–centroid distance being 3.672 (3) Å. The crystal structure of the compound indicates the 2,6-distyryl substituents have an E configuration

rac-2-(2-Amino-4-oxo-4,5-dihydro-1,3-thia­zol-5-yl)-2-hydroxy­indane-1,3-dione

In the crystal of the title compound, C12H8N2O4S, mol­ecules are linked into chains by a series of inter­molecular O—H⋯O, N—H⋯O and N—H⋯N hydrogen bonds. The ninhydrin and amino­thia­zolidine units make a dihedral angle of 66.41 (3)°. The crystal structure indicates the presence of equimolar R and S enanti­omers in the crystal lattice, due to the presence of a chiral centre in the title compound

(Z)-4-[3-(3-Oxoquinuclidin-2-ylidene­meth­yl)-1H-indol-1-ylmeth­yl]benzo­nitrile

The title compound, C24H21N3O, was prepared by the reaction of (Z)-2-(1H-indol-3-ylmethyl­ene)-1-aza­bicyclo­[2.2.2]octan-3-one with α-bromo-p-toluonitrile, under phase-transfer catalytic (PTC) conditions using triethyl­benzyl­ammonium chloride and 50% w/v aqueous NaOH solution in dichloro­methane. The crystal structure indicates the presence of a double bond with Z geometry connecting the aza­bicyclic and indole groups

(Z)-4-[3-(2,5-Dioxoimidazolidin-4-ylidenemeth­yl)-1H-indol-1-ylmeth­yl]benzonitrile

In the title compound, C20H14N4O2, mol­ecules are linked into chains by N—H⋯O hydrogen bonds, but the cyano group does not participate in the supra­molecular aggregation. The crystal structure of the compound indicates the presence of a double bond with Z geometry, connecting the imidazolidine and indole units. The dihedral angle between the imidazole and benzene ring planes is 62.45 (4)°

3-(2-Amino-1-methyl-4-oxo-4,5-dihydro-1H-imidazol-5-yl)-3-hydroxy­indolin-2-one monohydrate

Two chiral centres exist in the title compound, C12H12N4O3·H2O. Mol­ecules are linked into chains by series of inter­molecular N—H⋯O and O—H⋯N hydrogen bonds, which causes supra­molecular aggregation. Two chiral centres are formed in the title compound. The indole and creatinine moieties make a dihedral angle of 56.75 (4)°. The crystal structure of the compound indicates the presence of equimolar enantio­mers (RR and SS) in the crystal structure

(2Z,3E)-2-{[1-(4-Chloro­benz­yl)-1H-indol-3-yl]methyl­idene}quinuclidin-3-one oxime

In the title compound, C23H22ClN3O, the benzene ring of the 4-chorobenzyl group makes a dihedral angle of 78.56 (6)° with the best plane of the indole ring. The double bond connecting the aza­bicyclic and indole groups adopts a Z geometry. The geometry adopted by the C=N bond with respect to the N—OH bond is trans. The absolute configuration of the compound was determined from refinement of the Flack parameter