Table 1. Hydrogen-bond geometry (Å, °).

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1—H1N⋯O2	0.850 (9)	2.204 (10)	3.023 (2)	161.9 (16)
N2—H2N⋯O1	0.837 (9)	2.210 (10)	3.013 (2)	161.0 (16)