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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O5—H5⋯O4i	0.83 (2)	1.95 (2)	2.770 (2)	169 (3)
N1—H1⋯O5ii	0.86 (2)	2.35 (2)	3.156 (3)	156 (3)
N2—H2⋯O1ii	0.89 (2)	2.19 (2)	2.949 (2)	143 (3)
N3—H3⋯O4i	0.88 (2)	2.28 (3)	2.955 (3)	133 (3)
N4—H4⋯O5iii	0.88 (2)	2.10 (2)	2.928 (3)	157 (3)
O5—H6⋯O2iv	0.84 (2)	1.85 (2)	2.666 (3)	163 (4)
C3—H3B⋯O3v	0.99	2.36	3.345 (3)	175

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