171259-65-7 L-Aspartic acid, N-(1-O-((3-beta,20-beta,29(S))-29-((3-methoxy-1-(methoxycarbonyl)-3-oxopropyl)amino)-11,29-dioxoolean-12-en-3-yl)-2-O-(N-(3-methoxy-1-(methoxycarbonyl)-3-oxopropyl)-beta-D-glucopyranuronamidosyl)-alpha-D-glucopyranuronoyl)-, dimethyl ester, (S)-