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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1—H1N⋯O1i	0.89 (5)	2.03 (5)	2.891 (4)	163 (4)
N2—H2N⋯O1ii	0.96 (6)	1.91 (6)	2.847 (5)	164 (4)

Symmetry codes: (i) ; (ii) .