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Dihedral angles were calculated using Mercury (3.8; Macrae et al., 2006 ▸).
| Compound | C10—C8—C1—C2 | C9—C8—C1—C6 | C6—C1—C3—C16 | Ring I and II dihedral |
|---|---|---|---|---|
| KEMRUP | –116.1 (5) | –55.6 (6) | 67.0 (5) | 52.7 |
| β-Ket | –117.3 (4) | –57.1 (5) | 65.7 (5) | 51.9 |
| α-Ket mol. A | –121.0 (1) | –65.5 (2) | –66.5 (2) | 50.4 |
| α-Ket mol. B | 130.6 (1) | 70.0 (2) | 66.2 (2) | 51.0 |
