Table 1. Hydrogen-bond geometry (Å, °).
| D—H⋯A | D—H | H⋯A | D⋯A | D—H⋯A |
|---|---|---|---|---|
| N1—H1⋯O2i | 0.86 | 1.98 | 2.8383 (19) | 179 |
| C2—H2⋯O1ii | 0.93 | 2.55 | 3.453 (2) | 165 |
| C8—H8⋯O1ii | 0.98 | 2.36 | 3.170 (2) | 140 |
Symmetry codes: (i) 
; (ii) 
.
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