Synonyms: 2-Naphthalenesulfonicacid, 1,1'-methylenebis-, disodium salt (9CI); 2-Naphthalenesulfonic acid,1,1'-methylenedi-, disodium salt (7CI,8CI);1,1'-Methylenebis(naphthalene-2-sulfonic acid) disodium salt; Disodium a,a'-dinaphthylmethane-b,b'-disulfonate