Table 1. Hydrogen-bond geometry (Å, °).
| D—H⋯A | D—H | H⋯A | D⋯A | D—H⋯A |
|---|---|---|---|---|
| C7—H7⋯O30i | 0.93 | 2.55 | 3.216 (3) | 129 |
| C18—H18⋯O30ii | 0.93 | 2.44 | 3.197 (3) | 139 |
Symmetry codes: (i) 
; (ii) 
.
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