<p>Phytochemical investigation on the root of <em>R. laevigata</em> led the isolation and identification of two new flavonoids, (+)-catechin-8-acetic acid (<strong>1</strong>) and guibourtacacidine 4-methyl ether (<strong>2</strong>), one known flavonoid, guibourtacacidine (<strong>3</strong>), along with seven known triterpenoids, euscaphic acid (<strong>4</strong>), kajiichigoside F1 (<strong>5</strong>), nigaichigoside F2 (<strong>6</strong>), rubuside J (<strong>7</strong>), tomentic acid (<strong>8</strong>), rosamutin (<strong>9</strong>) and betulinic acid (<strong>10</strong>). Their structures were established on the basis of spectroscopic evidence and comparisons with literature data. Compounds <strong>1</strong>, <strong>2</strong> and <strong>3</strong> showed considerable radical scavenging activity in the 1, 1-diphenyl-2-picrylhydrazyl (DPPH) assay.<strong></strong></p>
2,4-Furfurylidene-D-sorbitol and its tetra-methyl ether: synthesis, conformational studies, and radical scavenging activity
