Table 1. Hydrogen-bond geometry (, ).
| DHA | DH | HA | D A | DHA |
|---|---|---|---|---|
| O1H1O2i | 0.82 | 1.84 | 2.6623(18) | 175 |
| C4H4O5ii | 0.93 | 2.58 | 3.257(3) | 130 |
Symmetry codes: (i) 
; (ii) 
.
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