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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1—H1N1⋯O2i	0.988 (16)	1.703 (16)	2.6899 (15)	176.8 (16)
N2—H1N2⋯O2ii	0.883 (16)	1.999 (16)	2.8756 (17)	171.7 (15)
N2—H2N2⋯O1i	0.936 (18)	1.878 (18)	2.8122 (17)	176.6 (17)

Symmetry codes: (i) ; (ii) .