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1.  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
2.  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

Results 1-2 (2)