(3beta,5xi,9xi,16alpha,18xi,21beta,22alpha)-16,21-bis(acetyloxy)-28-hydroxy-22-[(3-methylbutanoyl)oxy]olean-12-en-3-yl 4-O-(6-deoxyhexopyranosyl)hexopyranosiduronic acid 3-O-{alpha-L-rhamnopyranosyl(1-