In the title compound, C(14)H(10)ClN(3)O(4)·2CH(4)O, the main mol-ecule is in an E configuration with respect to the methyl-idene unit. The dihedral angle between the mean planes of the two benzene rings is 1.9 (3)°. In the crystal, inter-molecular N-H⋯O, O-H⋯O and bifurcated O-H⋯(O, O) hydrogen bonds link the components into sheets parallel to (100). An intra-molecular O-H⋯O hydrogen bond is also present.