.beta.-Strophanthobioside, strophanthidin-3 .beta.-k-Strophanthin 5.beta.-Card-20(22)-enolide, 3.beta.-[(2,6-dideoxy-4-o-.beta.-D-glucopyranosyl-3-o-methyl-.beta.-D-ribo-hexopyranosyl)oxy]-5,14-dihydroxy-19-oxo- 560-53-2 Card-20(22)-enolide, 3-[(2,6-dideoxy-4-O-.beta.-D-glucopyranosyl-3-O-methyl-.beta.-D-ribo-hexopyranosyl)oxy]-5,14-dihydroxy-19-oxo-, (3.beta.,5.beta.)- K-Strophanthin-.beta. NSC4320 STROPHANTHIN K Strophanthin Strophanthin K (crystalline)