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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.

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