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5?-Dihydro-vespertilin acetate.

ABSTRACT: In the title compound, C(24)H(36)O(4) [systematic name: (20S)-3?-acet-oxy-16?-hydr-oxy-22,23-bis-nor-5?,17?-cholano(22-16)lac-tone], the three six-membered rings adopt classical chair conformations, while the five-membered rings are in envelope conformations. The ester group attached to ring A is in an equatorial position. Rings A/B, B/C and C/D are trans-fused, whereas rings D/E are cis-fused. The structure is devoid of any classical hydrogen bonds. However, non-classical inter- and intra-molecular hydrogen-bonding inter-actions of the type C-H?O are present in the structure.

SUBMITTER: Benn M 

PROVIDER: S-EPMC2983680 | biostudies-literature | 2010 Feb

REPOSITORIES: biostudies-literature

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5α-Dihydro-vespertilin acetate.

Benn Michael M   Vohra Kanwal Nain KN   Parvez Masood M  

Acta crystallographica. Section E, Structure reports online 20100213 Pt 3

In the title compound, C(24)H(36)O(4) [systematic name: (20S)-3β-acet-oxy-16α-hydr-oxy-22,23-bis-nor-5α,17β-cholano(22-16)lac-tone], the three six-membered rings adopt classical chair conformations, while the five-membered rings are in envelope conformations. The ester group attached to ring A is in an equatorial position. Rings A/B, B/C and C/D are trans-fused, whereas rings D/E are cis-fused. The structure is devoid of any classical hydrogen bonds. However, non-classical inter- and intra-molec  ...[more]

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