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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1—H1⋯O2i	0.88 (1)	2.15 (2)	2.992 (3)	160 (3)
N2—H2⋯O3ii	0.88 (1)	2.23 (2)	2.961 (3)	140 (3)

Symmetry codes: (i) ; (ii) .