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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1—H1⋯O3	0.86 (2)	2.36 (2)	2.780 (2)	110.8 (17)
N1—H1⋯O2i	0.86 (2)	2.37 (2)	3.216 (2)	168.0 (18)
O2—H2⋯O5	0.84 (2)	2.15 (2)	2.920 (2)	152 (2)
O2—H2⋯O3ii	0.84 (2)	2.35 (2)	2.8188 (18)	116.1 (18)
O5—H5⋯O6	0.82	1.99	2.655 (2)	138

Symmetry codes: (i) ; (ii) .