Table 1. Hydrogen-bond geometry (, ).
| DHA | DH | HA | D A | DHA |
|---|---|---|---|---|
| N1H1O2i | 0.86 | 2.16 | 3.003(2) | 168 |
| N2H2O1ii | 0.86 | 2.23 | 3.004(2) | 150 |
| C1H1AO2i | 0.97 | 2.44 | 3.333(3) | 153 |
Symmetry codes: (i) 
; (ii) 
.
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