(9R,9'S)-4,4'-dihydroxy-2'-(hydroxymethyl)-10,10'-dioxo-5,5'-bis(((2S,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-2-yl)oxy)-9,9',10,10'-tetrahydro-[9,9'-bianthracene]-2-carboxylic acid;rel-(9R,9'S)-5,5'-Bis(?-D-glucopyranosyloxy)-9,9',10,10'-tetrahydro-4,4'-dihydroxy-2'-(hydroxymethyl)-10,10'-dioxo[9,9'-bianthracene]-2-carboxylic Acid; (R*,S*)-5,5'-Bis(?-D-glucopyranosyloxy)-9,9',10,10'-tetrahydro-4,4'-dihydroxy-2'-(hydroxymethyl)-10,10'-dioxo-[9,9'-bianthracene]-2-carboxylic Acid