1 Department of Applied Chemistry, China Agricultural University, Yuanmingyuan, West Road 2#, Haidian District, Beijing 100194, People's Republic of China.
In the crystal structure of the title compound, C(10)H(8)N(2)O(3)·H(2)O, mol-ecules are linked via inter-molecular O-H⋯O and O-H⋯N hydrogen bonds into a two-dimensional network.