Figure 2
The hydrogen bonding of the fumarate ion in the structure of the title compound. Displacement ellipsoids are drawn at the 50% probability level. Hydrogen atoms not involved in hydrogen bonds are omitted for clarity. Symmetry codes: (i) 2 − x, 1 − y, 2 − z, (iii) 1 − x, 1 + y, 1 + z, (iv) 1 − x, −y, 1 − z. |