1,3-Ninhydrin dihydrazone featuring an R₄⁴(12) motif with symmetry and comprising only N and H atoms

In the title compound [systematic name: (1Z,3Z)-1,3-di­hydra­zin­yl­idene-1H-inden-2(3H)-one], C₉H₈N₄O, isolated mol­e­cules possess approximate noncrystallographic C_2v symmetry and their cis conformation and planarity are assisted by a pair of short intra­molecular N-H...O hydrogen bonds. Each mol­ecule is asymmetrically involved in an extensive three-dimensional network of N-H...O and N-H...N hydrogen bonds, and the structure also exhibits weaker [pi]-[pi] and C=O...C inter­actions. The structure features an R₄⁴(12) motif consisting solely of N and H atoms and possessing crystallographic symmetry.