Table 1. Hydrogen-bond geometry (, ).
| DHA | DH | HA | D A | DHA |
|---|---|---|---|---|
| N2H2O3 | 0.86 | 1.94 | 2.752(4) | 157 |
| C2H2AO1i | 0.93 | 2.44 | 3.319(3) | 158 |
| C5H5O5A ii | 0.93 | 2.55 | 3.328(11) | 141 |
| C8H8O4A iii | 0.93 | 2.36 | 3.285(8) | 173 |
Symmetry codes: (i) 
; (ii) 
; (iii) 
.
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