Table 1. Hydrogen-bond geometry (, ).
| DHA | DH | HA | D A | DHA |
|---|---|---|---|---|
| N1NH1O2 | 0.93(3) | 1.96(3) | 2.678(3) | 133(3) |
| O3OH3O2i | 0.82 | 1.83 | 2.645(3) | 175 |
Symmetry code: (i) 
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