Table 2. Hydrogen-bond geometry (Å, °).

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N2—H2A⋯O4	0.85 (2)	2.17 (2)	2.965 (3)	157 (3)
N2—H2B⋯O2i	0.84 (2)	2.16 (2)	2.978 (3)	166 (3)
N4—H4A⋯O1	0.83 (3)	2.10 (3)	2.859 (3)	153 (3)
N4—H4B⋯O3ii	0.84 (2)	2.06 (2)	2.881 (3)	164 (3)

Symmetry codes: (i) ; (ii) .