Orientalols A, B, and C, sesquiterpene constituents from Chinese Alismatis Rhizoma, and revised structures of alismol and alismoxide.

Abstract

Three new sesquiterpenes named orientalols A, B, and C were isolated from Chinese Alismatis Rhizoma, the dried rhizome of Alisma orientale JUZEPCZUK, together with two known sesquiterpenes, alismol and alismoxide. On the basis of the chemical and physiconhemical evidence, the structures of orientalols A (3), B (4), and C(5) were determined and those of alismol and alismoxide were revised from 1' and 2' to 1 and 2, respectively.