Table 1. Hydrogen-bond geometry (, ).
| DHA | DH | HA | D A | DHA |
|---|---|---|---|---|
| O1H1N4i | 0.84 | 2.04 | 2.878(3) | 172 |
| O1aH1aN4i | 0.84 | 1.94 | 2.749(5) | 162 |
Symmetry code: (i) 
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