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organic compounds
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 OHO hydrogen bond generates infinite chains of molecules in the z direction.