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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1—H1N1⋯O3i	0.90 (2)	2.12 (2)	3.0193 (16)	176.7 (16)
N2—H1N2⋯O4ii	0.845 (18)	1.993 (19)	2.8262 (17)	169 (2)
N3—H1N3⋯O1iii	0.876 (18)	1.969 (18)	2.8307 (16)	167.3 (16)
N4—H1N4⋯O2iv	0.878 (19)	2.059 (19)	2.9320 (16)	172.3 (19)
C1—H1A⋯O4ii	0.93	2.48	3.1879 (17)	133
C3—H3A⋯O1iii	0.93	2.56	3.2854 (17)	135
C12—H12C⋯O3i	0.96	2.52	3.433 (2)	159
C18—H18C⋯N4	0.96	2.61	2.9347 (19)	100

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