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1.  3-{5-Eth­oxy­carbonyl-1-[3-(2-oxopyrrol­idin-1-yl)prop­yl]-1H-benzimidazol-2-yl}benzoic acid 
In the title compound, C24H25N3O5, the eth­oxy group is disordered over two orientations in a 0.853 (14):0.147 (14) ratio. The benzimadazole ring system (r.m.s. deviation = 0.016 Å) makes a dihedral angle of 35.47 (7)° with the attached benzene ring. The pyrrolidine ring adopts an envelope conformation with a methyl­ene C atom as the flap. In the crystal, inversion dimers linked by pairs of O—H⋯N hydrogen bonds generate R 2 2(16) loops. C—H⋯O inter­actions link the dimers into a three-dimensional network.
doi:10.1107/S1600536813001116
PMCID: PMC3569823  PMID: 23424569
2.  Ethyl 1-[2-(morpholin-4-yl)eth­yl]-2-[4-(morpholin-4-yl)phen­yl]-1H-1,3-benzimidazole-5-carboxyl­ate 
The asymmetric unit of the title compound, C26H32N4O4, consists of two independent mol­ecules. In both mol­ecules, the eth­oxy groups are each disordered over two sets of sites with occupancies of 0.695 (4):0.305 (4) and 0.877 (2):0.123 (2). The dihedral angles between the benzimidazole ring system and the adjacent benzene ring in the two mol­ecules are 41.41 (5) and 31.46 (5)°. In the crystal, mol­ecules are linked by C—H⋯O and C—H⋯N inter­actions.
doi:10.1107/S1600536811023294
PMCID: PMC3152030  PMID: 21837149

Results 1-2 (2)