 | Acta Crystallographica Section B Acta Crystallographica Section B STRUCTURAL SCIENCE, CRYSTAL ENGINEERING AND MATERIALS |
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![[Figure 5]](sn5016fig5mag.jpg)
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Figure 5
The carboxylic side-chain conformations for the molecules of oxo-cholic acid derivatives in the six determined structures. The fragments are projected on the mean planes of the five membered D rings of the alicyclic skeletons. Each side-chain conformation is defined by the four torsion angles: ψ1 = C13—C17—C20—C22, ψ2 = C17—C20—C22—C23, ψ3 = C20—C22—C23—C24 and ψ4 = C22—C23—C24—O28H and using the symbols: t = trans, g = gauche and c = cis. (a) (I), conformation = t t t t; (b) (II), conformation = g t t t; (c) (III), conformation = t t g t; (d) (IV-α), conformation = t g t g; (e) (IV-β)A, conformation = t t g c; (f) (IV-β)B, conformation = t t t – (because of the disorder, the torsion angle ψ4 is not defined); (g) (V), conformation = t g t t. |
![[Figure 5]](sn5016fig5.jpg)
| STRUCTURAL SCIENCE CRYSTAL ENGINEERING MATERIALS |
ISSN: 2052-5206
