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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1—H1⋯O1i	0.891 (9)	2.221 (10)	3.0917 (16)	165.7 (14)
N2—H2⋯O2	0.901 (9)	2.029 (10)	2.9144 (15)	167.2 (16)
N4—H4⋯O1	0.897 (9)	1.956 (10)	2.8488 (16)	173.3 (18)

Symmetry code: (i) .