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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1—H1⋯O1	0.88	2.12	2.7705 (16)	130
N2—H2⋯O3	0.88	1.96	2.6731 (14)	137
N3—H3⋯O5	0.88	2.27	2.7399 (14)	113
N4—H8⋯O7	0.88	2.16	2.7341 (16)	122
N4—H8⋯O4i	0.88	2.54	3.1841 (17)	131

Symmetry code: (i) .