Table 1. Hydrogen-bond geometry (Å, °).
| D—H⋯A | D—H | H⋯A | D⋯A | D—H⋯A |
|---|---|---|---|---|
| N4—H4B⋯N3i | 0.79 (7) | 2.25 (7) | 3.014 (6) | 165 (7) |
| N4—H4C⋯N2ii | 0.80 (6) | 2.34 (6) | 3.103 (6) | 161 (6) |
Symmetry codes: (i) 
; (ii) 
.
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