131189-57-6 2H-Pyran-5-carboxylic acid, 3-ethenyl-2-(beta-D-glucopyranosyloxy)-3,4-dihydro-4-(2-((3,4,5-trihydroxybenzoyl)oxy)ethyl)-, methyl ester, (2S-(2alpha,3beta,4beta))- Cornuside