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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O1—H1⋯O2i	0.82 (6)	1.82 (5)	2.627 (5)	171 (7)
O3—H3⋯O4ii	0.81 (2)	1.80 (2)	2.602 (4)	169 (7)
N4—H4A⋯O5iii	0.87 (4)	2.08 (3)	2.888 (5)	155 (5)
N4—H4B⋯O4	0.86 (2)	1.86 (2)	2.719 (4)	177 (5)
N5—H5A⋯N3iv	0.89 (5)	2.21 (5)	3.088 (5)	171 (6)
N5—H5B⋯O5v	0.87 (2)	2.14 (5)	2.799 (5)	132 (5)
N2—H2⋯O2	0.87 (2)	1.81 (2)	2.663 (4)	170 (6)

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