Showing structure for (2s)-2-[(1r,2r,3r,4r)-2-{[(1s)-1-carboxy-2-(3,4-dihydroxyphenyl)ethoxy]carbonyl}-3,4-bis(3,4-dihydroxyphenyl)cyclobutanecarbonyloxy]-3-(3,4-dihydroxyphenyl)propanoic acid