The structure of the title compound, C(17)H(15)N(3)O(4), displays inter-molecular O-H⋯N and O-H⋯O hydrogen bonding between adjacent mol-ecules. Intra-molecular O-H⋯O hydrogen bonds also occur. The molecule is essentially planar with a deviation of 0.090 (1) Å from the best plane running through the connected ring systems.