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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N2—H2N⋯O1i	0.87 (1)	2.14 (2)	3.0049 (18)	171 (2)
N3—H3N⋯O2ii	0.84 (1)	2.05 (2)	2.8837 (18)	173 (2)
N1—H1N⋯O3	0.86 (1)	2.21 (2)	3.0394 (18)	163 (2)
N4—H4NC⋯O1iii	0.89 (1)	2.05 (2)	2.9445 (18)	178 (2)
N4—H4NB⋯O3iv	0.89 (2)	1.94 (2)	2.7666 (19)	155 (2)
N4—H4NA⋯O2v	0.88 (2)	1.83 (2)	2.6992 (19)	169 (2)

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