Synonyms: 10,10'-Bianthrone,1,1',8,8'-tetrahydroxy- (6CI,7CI); 1,1',8,8'-Tetrahydroxy-10,10'-bi-9(10H)-anthrone;1,1',8,8'-Tetrahydroxy-10,10'-bianthrone; 1,1',8,8'-Tetrahydroxybisanthrone;1,8,1',8'-Tetrahydroxydianthrone; Anthralin dimer; Bianthralin; Dianthrone