Table 1. Hydrogen-bond geometry (Å, °).
| D—H⋯A | D—H | H⋯A | D⋯A | D—H⋯A |
|---|---|---|---|---|
| N1—H1A⋯N2i | 0.88 | 2.25 | 3.132 (3) | 177 |
| N1—H1B⋯O1ii | 0.88 | 2.15 | 2.955 (2) | 151 |
| C3—H3⋯N2iii | 0.95 | 2.48 | 3.226 (3) | 135 |
Symmetry codes: (i) 
; (ii) 
; (iii) 
.
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