In the title mol-ecule, C(11)H(14)N(2)O(3), an intra-molecular O-H⋯O hydrogen bond closes an almost planar [maximum deviation = 0.022 (13) Å] six-membered ring and enforces the cis conformation of the keto group with respect to the hy-droxy substituent. In the crystal, inter-molecular N-H⋯O hydrogen bonds link the moleclues into ribbons extended along [10]. Weak inter-molecular C-H⋯O inter-actions further consolidate the crystal packing.