Bis[6-amino-3-methyl-5-nitrosopyrimidine-2,4(1H,3H)-dionato]diaquazinc(II) dihydrate, redetermined at 120 K: a three-dimensional hydrogen-bonded framework.

The title compound, whose structure has been redetermined at 120 K, contains almost centrosymmetric trans-[Zn(C(5)H(5)N(4)O(3))(2)(H(2)O)(2)].2H(2)O units, together with two uncoordinated water molecules. An extensive series of O-H.O, O-H.N and N-H.O hydrogen bonds gives rise to a three-dimensional framework structure.