4-Amino-6-benzyloxy-2-(methylsulfanyl)-5-nitrosopyrimidine: hydrogen-bonded dimers linked into pi-stacked chains.

The title compound, C(12)H(12)N(4)O(2)S, crystallizes with Z' = 2 in space group P2(1)/c. The intramolecular dimensions are consistent with a highly polarized electronic structure. Each of the independent molecules forms a centrosymmetric dimer linked by paired N-H.N hydrogen bonds, and these dimers are linked into a single type of chain by aromatic pi-pi-stacking interactions.