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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O4—H4B⋯O7	0.82	1.92	2.670 (5)	152
O4—H4A⋯O1i	0.82	1.85	2.641 (3)	162
O7—H7C⋯O6ii	0.82	2.03	2.807 (7)	158
O7—H7D⋯O1iii	0.82	2.09	2.797 (5)	144

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