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Acta Crystallogr Sect E Struct Rep Online. 2008 Jul 31;64(Pt 8):o1643-4. doi: 10.1107/S1600536808022368.

Hoodigogenin A from Hoodia gordonii.

Abstract

The title mol-ecule (systematic name: 12-O-β-tigloyl-3β,14β-dihydroxy-pregn-5-en-20-one), C(26)H(38)O(5), isolated from aerial parts of Hoodia gordonii, has its steroid A and C rings in chair conformations, its B ring in a half-chair conformation, and its five-membered ring in an envelope conformation. The OH group at the C/D ring junction forms an intra-molecular hydrogen bond with the keto substituent. The OH group on the A ring forms an inter-molecular hydrogen bond with the tiglate C=O group, propagating [010] chains in the crystal structure.

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