Spiro-biflavonoids from Larix olgensis HENRY var.koreana NAKAI

摘要

Four new spiro-biflavonoids,named olgensisinols A-D(1-4),along with a known one,vitisinol(5),were isolated from the stem bark of Larix olgensis HENRY var.koreana NAKAI.Their structures were established on the basis of spectroscopic analysis and molecular-model studies.