Synonyms: Iodosulphalein;Iodosulphthalein;Iodosulfophthalein;Sulfoiodophthalein;Phenolphthalein, 4,5,6,7-tetraiodo-3',3''-disulfo-, disodium salt (7CI,8CI);Benzenesulfonic acid, 5,5'-(4,5,6,7-tetraiodo-3-oxo-1(3H)-isobenzofuranylidene)bis(2-hydroxy-,disodium salt;AC1L43IY;LS-32088;5549-75-7;disodium 2-hydroxy-5-[1-(4-hydroxy-3-sulfonatophenyl)-4,5,6,7-tetraiodo-3-oxo-2-benzofuran-1-yl]benzenesulfonate