6,7,8,9-Tetra­hydro-4b,9b-dihy­droxy­indano[1,2-b]indoline-9,10-dione monohydrate

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