The New Pentacyclic Saponine Ecdysantherin [3β-Hydroxy-20-methylpregn-5,14-dien-16-one-(18–20)-lactone] from Ecdysanthera rosea Hook. et Arn. (Apocynaceae) of Vietnam

Ecdysantherin, 3β-hydroxy-20-methylpregn-5,14-dien-16-one-(18–20) lactone, C₂₁H₂₆O₄, a new pentacyclic saponine, was isolated from the powder of Ecdysanthera rosea Hook. et Arn. (Apocynaceae) of Vietnam, and its structure was elucidated. It was found that Ecdysantherin is a pentacyclic saponine molecule with three six-membered and two five-membered rings. An intermolecular OH...O hydrogen bond generates infinite chains of molecules in the z direction.

-1