Table 1. Hydrogen-bond geometry (Å, °).
| D—H⋯A | D—H | H⋯A | D⋯A | D—H⋯A |
|---|---|---|---|---|
| C19—H19⋯O2i | 0.98 | 2.41 | 3.338 (3) | 158 |
| C21—H21⋯O2i | 0.93 | 2.50 | 3.425 (4) | 173 |
| C37—H37⋯O1ii | 0.93 | 2.58 | 3.407 (4) | 148 |
Symmetry codes: (i) 
; (ii) 
.
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