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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1—H1N⋯O1i	0.84 (2)	2.09 (2)	2.922 (2)	168 (2)
N2—H2N⋯O3ii	0.82 (2)	2.06 (2)	2.883 (2)	179 (3)

Symmetry codes: (i) ; (ii) .