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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O7—H7B⋯O2i	0.77 (3)	2.57 (2)	2.971 (2)	114 (2)
O7—H7A⋯O6ii	0.95 (3)	1.95 (3)	2.884 (2)	167 (2)
O6—H6⋯O1iii	0.88 (2)	1.88 (2)	2.7368 (17)	167 (2)
O3—H3⋯O5	0.90 (2)	1.71 (2)	2.5658 (16)	159.6 (18)
O1—H1⋯O7iv	0.87 (2)	1.83 (2)	2.6630 (17)	160.4 (19)

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