Table 1. Hydrogen-bond geometry (, ).
| DHA | DH | HA | D A | DHA |
|---|---|---|---|---|
| N2H2AO1i | 0.91 | 2.13 | 2.932(2) | 147 |
| N1H1AO1i | 0.91 | 1.94 | 2.771(2) | 151 |
| N3H3AN3ii | 0.91 | 2.19 | 3.057(3) | 160 |
| N3H3BO1ii | 0.91 | 2.24 | 3.004(2) | 141 |
Symmetry codes: (i) 
; (ii) 
.
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