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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1—H1n⋯O5	0.91 (2)	1.98 (2)	2.8536 (16)	159 (2)
N3—H3n⋯O2	0.91 (2)	1.97 (2)	2.8384 (16)	159.0 (19)
N5—H5n⋯O8i	0.90 (2)	2.00 (2)	2.8796 (15)	163.9 (19)

Symmetry code: (i) .