[(24S,25S)-24-(β-D-Glucopyranosyloxy)-2α-hydroxyspirost-5-en-3β-yl]4-O-[2-O-(β-D-glucopyranosyl)-3-O-[4-O-(β-D-glucopyranosyl)-β-D-xylopyranosyl]-β-D-glucopyranosyl]-β-D-galactopyranoside