Synonyms: 1,4,4a,5,12,12a-Hexahydro-4,4a,11,12a-tetrahydroxy-3,8-dimethoxy-9-methoxycarbonyl-10-methyl-1,5,12-trioxonaphthacene;2-Naphthacenecarboxylic acid, 6,6a,7,10,10a,11-hexahydro-6a,7,10a,12-tetrahydroxy-3,8-dimethoxy-1-methyl-6,10,11-trioxo-, methyl ester