Table 1. Hydrogen-bond geometry (, ).
| DHA | DH | HA | D A | DHA |
|---|---|---|---|---|
| O3H3AO5i | 0.82 | 1.88 | 2.697(2) | 175 |
| O6H6AO2ii | 0.82 | 1.83 | 2.651(3) | 174 |
Symmetry codes: (i) 
; (ii) 
.
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