Table 1. Hydrogen-bond geometry (, ).
| DHA | DH | HA | D A | DHA |
|---|---|---|---|---|
| C2H2O1 | 0.93 | 2.33 | 2.885(3) | 118 |
| N1H1O1i | 0.89(2) | 1.99(3) | 2.843(2) | 160(2) |
Symmetry code: (i) 
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