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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1—H1B⋯O1i	0.90 (1)	2.21 (2)	3.0752 (19)	163 (2)
N2—H2⋯O1ii	0.85 (2)	2.03 (2)	2.8531 (18)	165 (2)

Symmetry codes: (i) ; (ii) .