3-O-beta-D-glucopyranosyl(1-2)-alpha-L-arabinopyranosylhederagenin 28-O-alpha-L-rhamnopyranosyl(1-4)-beta-D-glucopyranosyl(1-6)-beta-D-glucopyranosyl(1-4)-alpha-L-rhamnopyranosyl(1-4)-beta-D-glucopyranosyl(1-6)-beta-D-glucopyranoside