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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1—H1⋯O1i	0.86	2.05	2.825 (5)	149
N2—H2A⋯N2ii	0.89 (6)	2.27 (6)	3.151 (7)	172 (5)
N3—H3A⋯O2iii	0.86	2.10	2.812 (5)	140
N4—H4B⋯N4iv	0.80 (6)	2.40 (6)	3.155 (6)	158 (5)

Symmetry codes: (i) ; (ii) ; (iii) ; (iv) .