Table 1. Hydrogen-bond geometry (, ).
| DHA | DH | HA | D A | DHA |
|---|---|---|---|---|
| N2H2BO2 | 0.86 | 2.08 | 2.6903(16) | 128 |
| N2H2AO2i | 0.86 | 2.17 | 2.9964(16) | 161 |
| N2H2BO4ii | 0.86 | 2.38 | 3.0908(17) | 140 |
Symmetry codes: (i) 
; (ii) 
.
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