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In the title compound, C 25 H 20 N 6 O 2 ·0.15H 2 O, the dihedral angles between the least-squares planes of the indole and pyrrolidine rings and between the oxindole and imidazole rings are 77.66 (7) and 45.31 (7)°, respectively. The pyrrolidine ring and the fused five-membered pyrrolidine ring of the oxindole moiety exhibit twisted conformations. The amide N atom is involved in both intra- and inter­molecular hydrogen bonding, having a bifurcated character. The mol­ecular structure is characterized by an intra­molecular N—H⋯O hydrogen bond, which generates an  S (7) ring motif while an inter­molecular N—H⋯O hydrogen bond links the organic and solvent water mol­ecules. In the crystal, N—H⋯N hydrogen bonds generate a zigzag chain running parallel to  c- axis direction. The H atoms of the solvent water mol­ecule were not located.

4′-(1H-Imidazol-2-yl)-3′-[(1H-indol-3-yl)carbonyl]-1′-methyl-2-oxospiro[indoline-3,2′-pyrrolidine]-3′-carbonitrile 0.15-hydrate