Abstract
Convallagenin-A (I) was isolated from the flowers of Convallaria keisukei MIQ. and was shown to be a new 25L, 1, 3, 5-trihydroxyspirostane due to the conversion of it to ⊿1, 4-tigogenone (XII). All of the hydroxyl groups in I were indicated to have β-configuration as a result of forming the 1, 5-carbonate (XIII), the 3, 5-carbonate (XIX), and the orthoester (XX). The chemical structure of convallagenin-A (I) was thus elucidated as 25L, 5β-spirostan-1β, 3β, 5β-triol.
