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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1—H1N1⋯O2i	1.017 (17)	1.682 (17)	2.6901 (14)	170.6 (17)
N2—H1N2⋯O1i	0.939 (16)	1.886 (16)	2.8207 (15)	173.3 (14)
N2—H2N2⋯O2ii	0.920 (17)	1.947 (17)	2.8650 (16)	175.3 (16)
N3—H1N3⋯O1iii	0.903 (19)	2.18 (2)	3.027 (2)	156.0 (17)

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