Table 1. Hydrogen-bond geometry (Å, °).
| D—H⋯A | D—H | H⋯A | D⋯A | D—H⋯A |
|---|---|---|---|---|
| O2—H2o⋯O1i | 0.84 | 1.93 | 2.755 (2) | 166 |
| C5—H5a⋯O2ii | 0.99 | 2.47 | 3.296 (3) | 140 |
Symmetry codes: (i) 
; (ii) 
.
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