Table 1. Hydrogen-bond geometry (, ).
| DHA | DH | HA | D A | DHA |
|---|---|---|---|---|
| C1H1O3i | 0.95 | 2.41 | 3.240(7) | 146 |
| C7H3O2ii | 0.95 | 2.26 | 3.166(7) | 158 |
Symmetry codes: (i) 
; (ii) 
.
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