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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1—H11N⋯O4i	0.92 (4)	2.05 (4)	2.935 (4)	161 (4)
N2—H2N⋯O6ii	0.91 (4)	1.96 (4)	2.874 (4)	175 (4)
N3—H32N⋯O2iii	0.88 (4)	2.23 (4)	2.943 (4)	138 (4)
C3—H3⋯O1iv	0.95	2.54	3.254 (4)	132
N1—H12N⋯O3	0.86 (4)	2.18 (4)	2.938 (4)	146 (4)
N3—H31N⋯O6	0.85 (4)	2.09 (4)	2.831 (4)	145 (4)
N4—H4N⋯O3	0.85 (4)	2.11 (4)	2.952 (4)	171 (3)

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