In the title compound, C(22)H(20)N(2)O(4), the central benzene ring forms dihedral angles of 3.2 (2) and 61.1 (1)° with the two outer substituted benzene rings. Intra-molecular O-H⋯N hydrogen bonds are formed by both hydroxyl groups.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2968897PMC
http://dx.doi.org/10.1107/S1600536809008757DOI Listing

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