Table 1. Hydrogen-bond geometry (, ).
| DHA | DH | HA | D A | DHA |
|---|---|---|---|---|
| N2H2AO1i | 0.92(1) | 1.95(1) | 2.8526(17) | 166(2) |
| N1H1AN3ii | 0.92(1) | 2.10(1) | 2.988(2) | 163(2) |
Symmetry codes: (i) 
; (ii) 
.
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