Synonyms: Benzo[kl]xanthene-1,2-dicarboxylicacid, 6,9,10-trihydroxy-, bis[(1R)-1-carboxy-2-(3,4-dihydroxyphenyl)ethyl]ester (9CI); Benzo[kl]xanthene-1,2-dicarboxylic acid, 6,9,10-trihydroxy-,bis[1-carboxy-2-(3,4-dihydroxyphenyl)ethyl] ester, [R-(R*,R*)]-; Yunnaneic acidH