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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1—H1⋯I2i	0.98	2.82	3.708 (3)	151
N2—H2⋯I2	0.98	2.78	3.634 (3)	146
N3—H3⋯I1ii	0.98	3.20	3.819 (3)	123
N3—H3⋯I2	0.98	3.13	3.897 (3)	137
N4—H4⋯I1iii	0.98	2.86	3.680 (3)	142

Symmetry codes: (i) -x-{\script{1\over 2}}, y-{\script{1\over 2}}, -z+{\script{1\over 2}}; (ii) -x+{\script{1\over 2}}, y+{\script{1\over 2}}, -z+{\script{1\over 2}}; (iii) -x, -y+1, -z.