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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O1—H1⋯O2i	0.82	1.83	2.6530 (14)	180
O6—H6⋯O5ii	0.82	1.83	2.6352 (15)	167
C2—H2⋯O7iii	0.93	2.44	3.3566 (17)	168
C4—H4⋯O6iv	0.93	2.52	3.4392 (19)	169

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