Table 1. Hydrogen-bond geometry (, ).
| DHA | DH | HA | D A | DHA |
|---|---|---|---|---|
| C2H2AN3i | 0.97 | 2.58 | 3.449(3) | 149 |
| C5H5O1ii | 0.93 | 2.29 | 3.211(2) | 173 |
| O2H1N3iii | 0.87 | 2.08 | 2.939(2) | 167 |
Symmetry codes: (i) 
; (ii) 
; (iii) 
.
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