9-(4-Hy­droxy-3-meth­oxy­phen­yl)-3,3,6,6-tetra­methyl-1,2,3,4,5,6,7,8,9,10-deca­hydro­acridine-1,8-dione

In the title mol­ecule, C₂₄H₂₉NO₄, the central ring of the acridinedione system adopts a flat boat conformation and the four essentially planar atoms of this ring [maximum deviation = 0.001 (2) Å] form a dihedral angle of 85.99 (12)° with the benzene ring. The two outer rings of the acridinedione system adopt sofa conformations. In the crystal, O—H...O and N—H...O hydrogen bonds link the mol­ecules, forming a two-dimensional network parallel to (100).