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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N2—H21⋯N1i	0.94 (2)	2.15 (2)	3.071 (1)	168 (1)
N2—H22⋯N1ii	0.94 (2)	2.15 (2)	3.090 (1)	177 (1)

Symmetry codes: (i) ; (ii) .