Synonyms: Benzoicacid, 2-[(3,5-dibromo-4-hydroxyphenyl)(3,5-dibromo-4-oxo-2,5-cyclohexadien-1-ylidene)methyl]-,ethyl ester, potassium salt (9CI);Phenolphthalein, 3',3'',5',5''-tetrabromo-,ethyl ester, potassium deriv. (6CI);Tetrabromophenolphthalein ethyl esterpotassium salt;