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