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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N4—H4B⋯O1i	0.86	1.96	2.766 (4)	156
N2—H2B⋯O1ii	0.86	1.82	2.675 (4)	170

Symmetry codes: (i) ; (ii) .