IUPAC:10a,10'a-dimethyl (5R,5'R,6S,6'S,10aR,10'aR)-1,1',5,5',8,8'-hexahydroxy-6,6'-dimethyl-9,9'-dioxo-5H,5'H,6H,6'H,7H,7'H,9H,9'H,10aH,10'aH-[2,2'-bixanthene]-10a,10'a-dicarboxylate
IUPAC:10a,10'a-dimethyl (5R,5'R,6S,6'S,10aR,10'aR)-1,1',5,5',8,8'-hexahydroxy-6,6'-dimethyl-9,9'-dioxo-5H,5'H,6H,6'H,7H,7'H,9H,9'H,10aH,10'aH-[2,2'-bixanthene]-10a,10'a-dicarboxylate