Digoxin (FDA); Lanoxin; (3beta,5beta,12beta)-3-{[2,6-dideoxy-beta-D-ribo-hexopyranosyl-(1->4)-2,6-dideoxy-beta-D-ribo-hexopyranosyl-(1->4)-2,6-dideoxy-beta-D-ribo-hexopyranosyl]oxy}-12,14-dihydroxycard-20(22)-enolide; (3beta,5beta,8xi,9xi,12beta)-3-{[2,6-dideoxy-beta-D-ribo-hexopyranosyl-(1->4)-2,6-dideoxy-beta-D-ribo-hexopyranosyl-(1->4)-2,6-dideoxy-beta-D-ribo-hexopyranosyl]oxy}-12,14-dihydroxycard-20(22)-enolide