(3beta,5beta,14xi,16beta)-3-{[2,6-dideoxy-alpha-D-ribo-hexopyranosyl-(1->4)-3-O-acetyl-2,6-dideoxy-alpha-D-ribo-hexopyranosyl-(1->4)-3-O-acetyl-2,6-dideoxy-alpha-D-ribo-hexopyranosyl]oxy}-14,16-dihydroxycard-20(22)-enolide