In the title compound, C(16)H(18)N(2)O(4)S, the dihedral angle between the hy-droxy-phenyl ring and the plane of the thio-urea moiety is 54.53 (8)°. The H atoms of the NH groups of thio-urea are positioned anti to each other. In the crystal, inter-molecular N-H⋯S, N-H⋯O, and O-H⋯S hydrogen bonds link the mol-ecules into a three-dimensional network.