Bis(4-hy­droxy­phen­yl) 1,4-phenyl­enebiscarbamate

The title compound, C(20)H(16)N(2)O(6) (systematic name: 4-hy­droxy­phenyl N-{4-[(4-hy­droxy­phen­oxy­carbon­yl)amino]­phen­yl}carbamate), contains two urethane groups substituting the central benzene ring in para positions. The mol­ecule is centrosymmetric, and displays a twisted conformation for the three aromatic rings [the dihedral angle between central benzene ring and the urethane group is 33.4 (6)°, and that between the latter and the terminal ring is 65.1 (1)°]. In the crystal, a three-dimensional framework is formed through O—H⋯O and N—H⋯O hydrogen bonds involving the hy­droxy and urethane functional groups, respectively. [Image: see text]