Table 1. Hydrogen-bond geometry (, ).
| DHA | DH | HA | D A | DHA |
|---|---|---|---|---|
| C2H2N6i | 0.93 | 2.59 | 3.432(3) | 151 |
| C11H11N7ii | 0.93 | 2.60 | 3.528(3) | 173 |
| C10H10N1iii | 0.93 | 2.63 | 3.438(2) | 146 |
Symmetry codes: (i) 
; (ii) 
; (iii) 
.
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