158109-41-2 L-Glutamic acid, N-((3-beta-20-beta)-3-((N-(4-methoxy-1-(methoxycarbonyl)-4-oxobutyl)-2-O-(N-4-methoxy-1-(methoxycarbonyl)-4-oxobutyl)-beta-D-glucopyranuronamidosyl)-alpha-D-glucopyranuronamidosyl)oxy)-11,29-dioxoolean-12-en-29-yl)-, dimethyl ester, (S-(R*,R*))-