Table 1. Hydrogen-bond geometry (, ).
| DHA | DH | HA | D A | DHA |
|---|---|---|---|---|
| N2H2AO1i | 0.86 | 1.97 | 2.725(3) | 146 |
| O2H2BO2ii | 0.82 | 1.69 | 2.491(5) | 166 |
Symmetry codes: (i) 
; (ii) 
.
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