(alphaR)-alpha-[[(2E)-3-[3-[[(1Z)-1-Carboxy-2-(3,4-dihydroxyphenyl)ethenyl]oxy]-4-hydroxyphenyl]-1-oxo-2-propen-1-yl]oxy]-3,4-dihydroxybenzenepropanoic acid [ 444179-57-1 ]