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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 R22(16) loops. C—H...O inter­actions link the dimers into a three-dimensional network.

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The mol­ecular structure of the title compound, C12H19NO5, may be visualized as made up of two nearly perpendicular planes [dihedral angle = 87.39 (12)°] and its crystal structure is a good example of C—H...O inter­actions assuming significance in optimizing supra­molecular aggregation in crystals in a mol­ecule which is severely imbalanced in terms of donors to acceptor atoms. The pyrrolidine ring adopts a (3T2) twist conformation with puckering parameters Q = 0.2630 (4) Å and φ = 59 (9)°. The crystal structure features R24(10) and R34(26) ring motifs formed by four weak C—H...O inter­actions, leading to supra­molecular sheets lying parallel to the bc plane.

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The asymmetric unit of the title compound, C29H24FNO5·0.5CH3OH, contains two independent mol­ecules and a one methanol solvent mol­ecule. The methanol mol­ecule is O—H...O hydrogen bonded to one of the independent mol­ecules. The pyrrolidine rings in both mol­ecules adopt half-chair conformations, while the cyclo­pentane rings within the indane groups are in flattened envelope conformations, with the spiro C atoms forming the flaps. The benzene rings of the indane ring systems form a dihedral angle of 35.06 (7)° in one independent mol­ecule and 31.16 (8)° in the other. The fluoro-substituted benzene ring forms dihedral angles of 65.35 (6) and 85.87 (7)° with the indane group benzene rings in one mol­ecule, and 72.78 (8) and 77.27 (8)° in the other. In each mol­ecule, a weak intra­molecular C—H...O hydrogen bond forms an S(6) ring motif. In the crystal, weak C—H...O, C—H...N and C—H...F hydrogen bonds link the mol­ecules into a three-dimensional network.

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In the title compound, C24H23N3O2, the benzimidazole ring system makes dihedral angles of 7.28 (5) and 67.17 (5)°, respectively, with the planes of the benzene and phenyl rings, which in turn make a dihedral angle of 69.77 (6)°. In the crystal, mol­ecules are connected by C—H...N and C—H...O inter­actions, forming a layer parallel to the bc plane. A π–π inter­action, with a centroid–centroid distance of 3.656 (1) Å, is observed in the layer.

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In the title compound, C28H27FN4O3·H2O, the benzimidazole ring system is essentially planar with a maximum deviation of 0.028 (1) Å. It makes dihedral angles of 47.59 (5) and 60.31 (5)°, respectively, with the pyridine and benzene rings, which make a dihedral angle of 22.58 (6)° with each other. The pyrrolidine ring shows an envelope conformation with one of the methyl­ene C atoms as the flap. In the crystal, the components are connected into a tape along the b-axis direction through O—H...O and O—H...N hydrogen bonds and a π–π inter­action between the pyridine and benzene rings [centroid–centroid distance of 3.685 (8) Å]. The tapes are further linked into layers parallel to the ab plane by C—H...O and C—H...F inter­actions.

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In the title compound, C17H22FNO4, the pyrrolidine ring adopts an envelope conformation with the disordered com­ponents of the methylene C atom, with site occupancies of 0.896 (7) and 0.104 (7), being the flap on either side of the mean plane involving the other atoms of the ring. The carb­oxy­lic acid group forms dihedral angles of 72.06 (11) and 45.44 (5)° with the N-tert-but­oxy­carbonyl group and the 2-fluoro­benzyl group, respectively. In the crystal, two-dimensional layers of mol­ecules parallel to (001) are built through an R44(23) motif generated via O—H...O, C—H...O and C—H...F inter­actions, and an R22(11) motif generated by C—H...O and C—H...F inter­actions.

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The asymmetric unit of the title compound, C22H18N4O2S2, contains two mol­ecules. In one of them, the dihedral angles between the central benzene ring and the phenyl rings are 16.97 (8) and 20.97 (8)°, while the phenyl rings make a dihedral angle of 37.87 (8)°. In the other mol­ecule, the corresponding values are 34.92 (7), 53.90 (7) and 60.68 (8)°, respectively. In each mol­ecule, two intra­molecular N—H...O hydrogen bonds generate S(6) rings and a short C—H...S contact also occurs. In the crystal, N—H...S, N—H...O, C—H...O and C—H...S inter­actions link the mol­ecules into a three-dimensional network.
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