Table 2. Hydrogen-bond geometry (Å, °).
| D—H⋯A | D—H | H⋯A | D⋯A | D—H⋯A |
|---|---|---|---|---|
| N2—H2⋯O4i | 0.86 | 1.88 | 2.717 (7) | 165 |
| N4—H4⋯O3ii | 0.86 | 1.94 | 2.787 (7) | 167 |
| N6—H6⋯O3iii | 0.86 | 1.96 | 2.797 (7) | 163 |
Symmetry codes: (i) 
; (ii) 
; (iii) 
.
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