Table 4. Hydrogen-bond geometry (, ) for (3) .
| DHA | DH | HA | D A | DHA |
|---|---|---|---|---|
| N3H3O4 | 0.86(2) | 1.95(2) | 2.695(2) | 145(2) |
| C312H312O3 | 0.95 | 2.26 | 2.877(2) | 129 |
| C2H2O4i | 0.95 | 2.41 | 3.167(2) | 137 |
| C316H316O3ii | 0.95 | 2.47 | 3.314(2) | 148 |
Symmetry codes: (i) 
; (ii) 
.
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