4,4',6,7,7',8-hexahydroxy-1,1'-dimethoxy-6',7-dimethyl-5,6,7,8-tetrahydro-(2,2'-bianthracene)-9,9',10,10'-tetraone
4,4',6,7,7',8-hexahydroxy-1,1'-dimethoxy-6',7-dimethyl-5,6,7,8-tetrahydro-(2,2'-bianthracene)-9,9',10,10'-tetraone