Polyphyllin B (ForMosanin C)

(3beta,25R)-Spirost-5-en-3-yl O-6-deoxy-alpha-L-mannopyranosyl-(1-2)-O-[O-6-deoxy-alpha-L-mannopyranosyl-(1-4)-6-deoxy-alpha-L-mannopyranosyl-(1-4)]-beta-D-glucopyranoside