Table 1. Hydrogen-bond geometry (, ).
| DHA | DH | HA | D A | DHA |
|---|---|---|---|---|
| N3H3AO1 | 0.90(2) | 1.88(2) | 2.6527(18) | 144(2) |
| C4H4O2i | 0.93 | 2.57 | 3.403(2) | 150 |
Symmetry code: (i) 
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