141039-74-9 3-O-alpha-(2'-O-Acetyl)-D-xylopyranosyl-3beta-hydroxyolean-12-ene-28,29-dioic acid Olean-12-ene-28,29-dioic acid, 3-((2-O-acetyl-beta-D-xylopyranosyl)oxy)-, (3beta,20alpha)- Yiyeliangwanoside IV