Crystal and molecular structure of withanolide E, a new natural steroidal lactone with a 17α-side-chain
Abstract
An X-ray analysis, of withanolide E, a new steroidal lactone isolated from Withania somnifera Dun. chemotype III, (14α,17β,20α-trihydroxy-5β,6β-epoxy-1-oxo-17S,20S,22R-witha-2,24-dienolide) has disclosed that the side-chain possesses the unusual 17α-orientation.