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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1—H1⋯O1i	0.87 (4)	2.12 (4)	2.943 (4)	159 (4)
N1—H2⋯O3ii	0.80 (4)	2.11 (4)	2.900 (4)	171 (4)
N2—H3⋯O2ii	0.84 (4)	2.12 (4)	2.957 (4)	171 (4)
N2—H4⋯O1	0.84 (4)	2.13 (4)	2.960 (4)	172 (4)
N3—H5⋯O2	0.83 (5)	2.06 (5)	2.892 (4)	178 (5)
N3—H6⋯O3i	0.82 (5)	2.14 (5)	2.942 (4)	167 (5)

Symmetry codes: (i) ; (ii) .