Table 1. Hydrogen-bond geometry (, ).
| DHA | DH | HA | D A | DHA |
|---|---|---|---|---|
| N4H4AO2 | 0.90(1) | 1.77(1) | 2.655(3) | 166(3) |
| N5H5O1i | 0.90(1) | 1.73(1) | 2.632(3) | 176(3) |
| N6H6BO2i | 0.90(1) | 1.97(1) | 2.853(3) | 169(3) |
| N6H6AN1 | 0.90(1) | 2.21(1) | 3.099(3) | 169(3) |
Symmetry code: (i) 
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