Table 1. Hydrogen-bond geometry (, ).
| DHA | DH | HA | D A | DHA |
|---|---|---|---|---|
| N2H2AN3 | 0.86 | 2.31 | 3.1192(16) | 156 |
| N4H4AN1 | 0.86 | 2.25 | 3.0837(16) | 163 |
| C4H4O2i | 0.93 | 2.43 | 3.3262(19) | 160 |
Symmetry code: (i) 
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