Table 1. Hydrogen-bond geometry (, ).
| DHA | DH | HA | D A | DHA |
|---|---|---|---|---|
| N2H2NO5 | 0.86 | 1.96 | 2.677(3) | 140 |
| N3H3NO2 | 0.86 | 1.92 | 2.659(3) | 144 |
| C6H6O3i | 0.93 | 2.57 | 3.442(4) | 157 |
| C17H17CO2ii | 0.96 | 2.46 | 3.176(4) | 132 |
Symmetry codes: (i) 
; (ii) 
.
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