Card-20(22)-enolide, 3--((O-2,6-dideoxy-3-O-methyl-beta-D-ribo-hexopyranosyl-(1-4)-O-6-deoxy-3-O-methyl-beta-D-glucopyranosyl-(1-4)-O-2,6-dideoxy-3-O-methyl-beta-D-ribo-hexopyranosyl-(1-4)-2,6-dideoxy-beta-D-ribo-hexopyranosyl))