(2E)-2-(4-Hy-droxy-3-meth-oxy-benzyl-idene)hydrazinecarboxamide.

In the title compound, C(9)H(11)N(3)O(3), two mol-ecules are present in the asymmetric unit in which the 4-hy-droxy-3-meth-oxy-benzaldehyde and hydrazinecarboxamide units are almost planar [with r.m.s. deviations 0.0212 and 0.0066 Å, respectively, in one mol-ecule and 0.0346 and 0.0095 Å, respectively, in the other] and are oriented at dihedral angles of 9.7 (3) and 16.6 (3)°. In both mol-ecules, two S(5) ring motifs are present due to N-H⋯N and O-H⋯O hydrogen bonds. In the crystal, the mol-ecules are dimerized with each other due to pairs of N-H⋯O hydrogen bonds, forming an R(2) (2)(8) ring motif. O-H⋯O hydrogen bonds lead to the formation of a three-dimensional network.