Table 1. Hydrogen-bond geometry (Å, °).
| D—H⋯A | D—H | H⋯A | D⋯A | D—H⋯A |
|---|---|---|---|---|
| N1—H1N⋯O1i | 0.91 (7) | 1.95 (7) | 2.851 (7) | 170 (6) |
| N2—H2N⋯O2i | 0.77 (7) | 2.11 (7) | 2.872 (7) | 168 (8) |
Symmetry code: (i) 
.
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