6,7,8,9-Tetra-hydro-4b,9b-dihy-droxy-indano[1,2-b]indoline-9,10-dione monohydrate

In the title compound, C(15)H(13)NO(4)·H(2)O, the organic mol-ecule adopts a V-shaped conformation in which the dihedral angle between the five-membered rings is 68.33 (5)°. The cyclo-hexenone ring adopts an envelope conformation, with one of the methyl-ene C atoms displaced by 0.607 (4) Å from the plane through the other atoms. In the crystal, inter-molecular N-H⋯(O,O) and O-H⋯O hydrogen bonds link the components into (001) sheeets and C-H⋯O inter-actions and aromatic π-π stacking [centroid-centroid separation = 3.6176 (19) Å] help to consolidate the packing.