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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1—H1N⋯O3	0.85 (2)	2.15 (2)	2.971 (4)	162 (4)
N2—H2N⋯O2	0.85 (2)	2.12 (2)	2.954 (4)	166 (4)