2-(3,4-Dihydroxyphenyl)ethyl (2S-(2alpha,3E,4beta))-3-ethylidene-2-(beta-D-glucopyranosyloxy)-3,4-dihydro-5-(methoxycarbonyl)-2H-pyran-4-acetate 32619-42-4 EINECS 251-129-6 Oleuropein