(3 beta,5 beta,16 beta)-3- ((O-2,6-dideoxy-beta-D-ribo-hexopyranosyl-(1-4)- O-2,6-dideoxy-beta-D-ribo-hexopyranosyl-(1-4)-2,6-dideoxy-beta-D-ribo-hexopyranosyl)oxy)-16-(formyl oxy)-14-hydroxycard-20(22)-enolide