4-[3,5-Bis(2-hy­droxy­phen­yl)-1H-1,2,4-triazol-1-yl]benzoic acid dimethyl­formamide monosolvate

In the mol­ecule of deferasirox dimethyl­formamide solvate, C(21)H(15)N(3)O(4)·C(3)H(7)NO, the central 1,2,4-triazole ring is tilted with respect to the benzoic acid and one of the 2-hy­droxy­phenyl units but coplanar with the other 2-hy­droxy­phenyl group, as indicated by the dihedral angles of 33.69 (9), 72.57 (8) and 5.18 (9)°, respectively. Intra­molecular O—H⋯N hydrogen bonds generate an S(6) ring motif. In the crystal, deferasirox mol­ecules are linked by O—H⋯N hydrogen bonds and weak C—H⋯O inter­actions into chains along the c axis. The dimethyl­formamide solvent mol­ecules are located between the deferasirox chains and are linked to the deferasirox mol­ecules by O—H⋯O hydrogen bonds and weak C—H⋯O inter­actions.