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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O1A—H4⋯O2B i	0.76 (3)	1.89 (3)	2.650 (4)	174 (4)
O2B—H3⋯O2A ii	0.84 (4)	1.84 (4)	2.668 (4)	171 (4)
O2A—H2⋯O1B	0.78 (4)	1.90 (4)	2.678 (4)	174 (4)
O1B—H1⋯O1A iii	0.84 (4)	1.86 (4)	2.680 (5)	167 (4)

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