4-[2-[2-Carboxy-6-hydroxy-5-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-2,3-dihydroindol-1-yl]ethenyl]-2,3-dihydropyridine-2,6-dicarboxylic acid
group of stereoisomers with the chemical formula C₂₄H₂₆N₂O₁₃