dimethyl 5,5'-dimethoxy-6,6'-bis[(methoxycarbonyl)oxy]-3,3'-bis(3-methoxy-3-oxopropyl)biphenyl-2,2'-dicarboxylate

3-(2-carboxyethyl)-6,6'-dihydroxy-5,5'-dimethoxy-[1,1'-biphenyl]-2,2'-dicarboxylic acid

1-(2-aminoethyl)-3,8-dimethoxychromeno[5,4,3-cde]chromene-5,10-dione

3,3'-(3,8-dimethoxy-5,10-dioxo-5,10-dihydrochromeno[5,4,3-cde]chromene-1,6-diyl)dipropanoic acid

3,3'-bis(2-carboxyethyl)-6,6'-dihydroxy-5,5'-dimethoxy-[1,1'-biphenyl]-2,2'-dicarboxylic acid