Table 2. Hydrogen-bond geometry (Å, °).
| D—H⋯A | D—H | H⋯A | D⋯A | D—H⋯A |
|---|---|---|---|---|
| O5—H1⋯O6 | 0.84 | 1.91 | 2.716 (4) | 160 |
| O5—H4⋯O5ii | 0.84 | 2.00 | 2.715 (4) | 142 |
| O6—H2⋯O6iii | 0.84 | 1.83 | 2.661 (3) | 170 |
| O6—H3⋯O5 | 0.84 | 1.90 | 2.716 (4) | 162 |
Symmetry codes: (ii) 
; (iii) 
.
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