[(25R)-5α-Spirostan-3β-yl]4-O-[2-O-[3-O-[3-O-[4-O-(α-L-rhamnopyranosyl)-β-D-glucopyranosyl]-β-D-glucopyranosyl]-β-D-glucopyranosyl]-β-D-glucopyranosyl]-β-D-galactopyranoside