Table 3. Hydrogen-bond geometry (Å, °) for (I) .
| D—H⋯A | D—H | H⋯A | D⋯A | D—H⋯A |
|---|---|---|---|---|
| O1—H1⋯O3i | 0.78 (4) | 1.87 (4) | 2.620 (3) | 159 (4) |
| O4—H4⋯O2ii | 0.84 (4) | 1.92 (4) | 2.723 (3) | 159 (3) |
Symmetry codes: (i) 
; (ii) 
.
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