Figure 2
The hydrogen bonding of the fumarate ion in the structure of the title compound (Table 1), with hydrogen bonds shown as dashed lines. 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, −z; (ii) − + x, − y, − + z; (iii) − x, + y, − z. |