for the following products
3',3'',5',5''-Tetrabromophenolphthalein ethyl ester K | 3,3',5,5'-Tetrabromophenolphthalein ethyl ester potassium salt | Potassium 2,6-dibromo-4-((3,5-dibromo-4-oxocyclohexa-2,5-dien-1-ylidene)(2-(ethoxycarbonyl)phenyl)methyl)phenolate and Tetrabromophenolphthalein ethyl ester potassium salt (TBPE)
