(E)-1-(3-Ethoxy-2-hydroxybenzylidene)thiosemicarbazide.

The title compound, C 10H 13N 3O 2S, crystallizes with two independent molecules (A and B) in the asymmetric unit. In the crystal, the A and B molecules are linked via pairs of N - H⋯O and O - H⋯S hydrogen bonds, forming dimers with R 2 2(14) and R 2 2(6) ring motifs. These dimers are linked via a pair of N - H⋯S hydrogen bonds with an R 2 2(8) ring motif, forming chains propagating along the c-axis direction. The crystal was refined as an inversion twin with a final BASF ratio of 0.54 (11):0.46 (11)