Table 1. Hydrogen-bond geometry (Å, °).
| D—H⋯A | D—H | H⋯A | D⋯A | D—H⋯A |
|---|---|---|---|---|
| C5—H5B⋯O4Ai | 0.99 | 2.27 | 3.231 (2) | 163 |
| C18—H18A⋯O4Aii | 0.98 | 2.49 | 3.354 (2) | 147 |
Symmetry codes: (i) 
; (ii) 
.
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