Table 1. Hydrogen-bond geometry (Å, °).
| D—H⋯A | D—H | H⋯A | D⋯A | D—H⋯A |
|---|---|---|---|---|
| O4—H4⋯O5i | 0.84 | 1.95 | 2.789 (2) | 175 |
| O5—H5⋯O2i | 0.84 | 1.98 | 2.812 (2) | 169 |
| C6—H6B⋯O5ii | 0.99 | 2.54 | 3.461 (3) | 155 |
Symmetry codes: (i) 
; (ii) 
.
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