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Figure 3
The hydrogen bonding (Table 2[link]) of a fumarate ion in the structure of bis­(4-hy­droxy-N-methyl­tryptammonium)­fumarate, with hydrogen bonds shown as dashed lines. Displacement ellipsoids are drawn at the 50% probability level. Hydrogen atoms not involved in hydrogen bonding are omitted for clarity. Symmetry codes: (i) 1 − x, −y, 2 − z; (ii) 2 − x, 1 − y, 2 − z; (iii) 1 − x, −y, 1 − z; (iv) 2 − x, −y, 2 − z; (v) x, y, 1 + z; (vi) −1 + x, y, z; (vii) −1 + x, −1 + y, z.

Journal logoCRYSTALLOGRAPHIC
COMMUNICATIONS
ISSN: 2056-9890
Volume 76| Part 4| April 2020| Pages 589-593
https://doi.org/10.1107/S2056989020004077
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