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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1—H1N⋯O1i	0.91 (4)	2.27 (4)	2.866 (3)	122 (3)
N2—H2N⋯O2ii	0.94 (4)	1.90 (4)	2.843 (4)	176 (4)

Symmetry codes: (i) ; (ii) .