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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O6—H6⋯O3i	0.83 (4)	1.77 (2)	2.602 (3)	173 (4)
O1—H1⋯O3ii	0.82 (2)	1.76 (2)	2.569 (3)	173 (5)
N1—H5⋯O1iii	0.88 (2)	2.26 (3)	2.929 (4)	133 (3)
N1—H5⋯O2iv	0.88 (2)	2.44 (3)	2.959 (3)	118 (3)
N1—H5⋯O5iv	0.88 (2)	2.47 (3)	3.065 (3)	125 (3)
N1—H4⋯O5	0.91 (2)	1.89 (2)	2.760 (4)	158 (3)
N1—H3⋯O4	0.90 (2)	1.86 (2)	2.752 (3)	174 (3)

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