Table 1. Hydrogen-bond geometry (Å, °).
| D—H⋯A | D—H | H⋯A | D⋯A | D—H⋯A |
|---|---|---|---|---|
| C7—H7A⋯O4i | 0.97 | 2.59 | 3.486 (7) | 153 |
| C9—H9B⋯O4ii | 0.97 | 2.47 | 3.376 (8) | 155 |
Symmetry codes: (i) 
; (ii) 
.
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