2-[(E)-2-(Nitro-methyl-idene)imidazolidin-1-yl]ethanol.

In the title compound, C(6)H(11)N(3)O(3), the imidazolidine NH group is involved in a three-center N-H⋯O hydrogen bond, with intra-molecular and inter-molecular branches, to the nitro group O atoms. The centrosymmetric dimers that are formed are further connected by O-H⋯O hydrogen bonds between the hy-droxy and nitro groups into a two-dimensional polymeric structure extending parallel to (101).