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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1—H1N1⋯O2i	0.91	1.99	2.896 (3)	172
N1—H3N1⋯O1ii	0.91	2.00	2.884 (3)	164
N1—H2N1⋯O4	0.91	1.81	2.713 (3)	175
N2—H1N2⋯O4i	0.91	1.87	2.771 (3)	169
N2—H3N2⋯O2iii	0.91	2.56	3.104 (3)	119
N2—H3N2⋯O3iii	0.91	2.04	2.927 (3)	166
N2—H2N2⋯O1iv	0.91	1.86	2.748 (3)	165

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