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Figure 1 A full molecular unit of the title compound, along with hydrogen bonded water molecule hexamer, showing 50% probability ellipsoids and the atom numbering scheme. Hydrogen atom positions are shown as gray sticks. Hydrogen bonding interactions are shown as dashed lines. Color codes: green Ni, light blue N, red O, black C. Symmetry codes: (i) −x, y, −z + ; (ii) −x − , −y + , −z |