Table 1. Hydrogen-bond geometry (, ).
| DHA | DH | HA | D A | DHA |
|---|---|---|---|---|
| C7H5O2i | 0.95 | 2.40 | 3.292(6) | 155 |
| C1H1O3ii | 0.95 | 2.31 | 3.264(5) | 148 |
Symmetry codes: (i) 
; (ii) 
.
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