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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1—H1N1⋯O1	1.07	1.76	2.753 (4)	153
N2—H2N2⋯O6i	0.89	2.24	3.120 (4)	171
N2—H1N2⋯O3ii	1.03	2.11	3.026 (5)	146
N3—H1N3⋯O6i	0.89	2.36	3.104 (4)	142
N3—H2N3⋯O5iii	1.00	2.24	3.217 (5)	163
C6—H6A⋯O3iv	0.93	2.56	3.299 (6)	136

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