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1.  Crystal structure of dimethyl 3,3′-[(3-nitro­phen­yl)methyl­ene]bis­(1H-indole-2-carboxyl­ate) ethanol monosolvate 
In the title compound, the planes of the two indole ring systems are approximately perpendicular to each other, with a dihedral angle of 89.3 (5)°.
In the title compound, C27H21N3O6·C2H5OH, the indole ring systems are approximately perpendicular to each other, with a dihedral angle of 89.3 (5)°; the plane of the benzene ring is oriented with respect to the indole ring systems at 49.9 (5) and 73.4 (3)°. In the crystal, mol­ecules are linked by N—H⋯O and O—H⋯O hydrogen bonds and weak C—H⋯π inter­actions into a three-dimensional supra­molecular architecture. A void of 33.0 (7) Å3 is observed in the crystal structure. The solvent ethanol molecule acts as a donor, forming an O—H⋯O hydrogen bond, reinforcing the framework structure.
doi:10.1107/S1600536814022296
PMCID: PMC4257280  PMID: 25484748
indole; crystal structure; MRI contrast agent
2.  2-(1-Benzo­thio­phen-2-yl)-4H-1,3,4-oxa­diazin-5(6H)-one 
In the title compound, C11H8N2O2S, the oxadiazinone ring is nearly planar [maximum deviation = 0.016 (4) Å], and is approximately coplanar with the benzo­thio­phene ring system [dihedral angle = 3.1 (5)°]. In the crystal, mol­ecules are linked by N—H⋯O hydrogen bonds, forming chains running along the b-axis direction.
doi:10.1107/S1600536813033291
PMCID: PMC3914084  PMID: 24526987
3.  Dimethyl 3,3′-(phenyl­methyl­ene)bis­(1H-indole-2-carboxyl­ate) 
In the title compound, C27H22N2O4, the two indole ring systems are approximately perpendicular to each other, with a dihedral angle of 84.5 (5)° between their planes; the benzene ring is twisted with respect to the two indole ring systems at angles of 78.5 (5) and 86.5 (3)°. In the crystal, mol­ecules are linked by N—H⋯O hydrogen bonds, weak C—H⋯O and C—H⋯N hydrogen bonds, and C—H⋯π inter­actions into a three-dimensional supra­molecular architecture.
doi:10.1107/S1600536813024471
PMCID: PMC3790385  PMID: 24098207
4.  Diethyl 3,3′-(phenyl­methyl­ene)bis­(1H-indole-2-carboxyl­ate) 
In the title compound, C29H26N2O4, the benzene ring is twisted by 73.5 (5) and 84.9 (3)° with respect to the mean planes of the two indole ring systems; the mean planes of the indole ring systems are oriented at a dihedral angle of 82.0 (5)°. In the crystal, mol­ecules are linked by pairs of N—H⋯O hydrogen bonds into chains.
doi:10.1107/S1600536812036239
PMCID: PMC3435799  PMID: 22969645
5.  6-Benzyl-6,7-dihydro-5H-pyrrolo­[3,4-b]pyridine-5,7-dione 
In the title compound, C14H10N2O2, the dihedral angle between the heterocyclic ring system and the phenyl ring is 45.8 (5)°. Weak inter­molecular C—H⋯N hydrogen bonding is present in the crystal structure.
doi:10.1107/S1600536811041006
PMCID: PMC3247312  PMID: 22219930

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