Table 6. Hydrogen-bond geometry (Å, °) for (IV) .
| D—H⋯A | D—H | H⋯A | D⋯A | D—H⋯A |
|---|---|---|---|---|
| C12—H12⋯O2i | 0.95 | 2.65 | 3.351 (2) | 131 |
| C15—H15⋯O3ii | 0.95 | 2.55 | 3.306 (2) | 137 |
| C21—H21⋯O4iii | 0.95 | 2.48 | 3.433 (2) | 176 |
Symmetry codes: (i) 
; (ii) 
; (iii) 
.
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