Showing structure for (1r,2s,6s,7r,8s,9r)-10-[(1e)-3-[(1r)-1-carboxy-2-(3,4-dihydroxyphenyl)ethoxy]-3-oxoprop-1-en-1-yl]-8-(3,4-dihydroxyphenyl)-2,6-dihydroxy-4-oxo-3-oxatricyclo[5.2.2.0²,⁶]undec-10-ene-9-carboxylic acid