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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
C4—H4⋯O2i	0.95	2.52	3.269 (2)	136
O1—H1O⋯O4	0.84 (3)	1.81 (3)	2.577 (2)	151 (3)

Symmetry code: (i) .