Fig. 7. Up: partial view of one-dimensional (1D) chain formed via N–H⋯O and N–H⋯N (black dash lines), and O–H⋯O (orange dash lines) hydrogen bond interactions along the b axis in the crystal structure of 3. Down: the 1D chains are connected via π⋯π stacking interaction (red dash lines) building a two-dimensional (2D) molecular assembly parallel to the (101) plane showed in two views. The symmetrically independent molecules are specified by different colors.