Get C13 H9 BR O5 S = 509 = 4-bromo-3-(carboxymethoxy)-5-phenylthiophene-2- carboxylic acid Get C13 H9 BR O6 S = 694 = 4-bromo-3-(carboxymethoxy)-5-(4-hydroxyphenyl) thiophene-2-carboxylic acid Get C20 H8 BR4 O10 S2 2- = bsp = 3,3p-(4,5,6,7-tetrabromo-3-oxo-1(3h)- isobenzofuranylidene)bis (6-hydroxybenzenesulfonic acid)anion; bromosulfalein Get C7 H5 BR O5 S = 512 = 4-bromo-3-(carboxymethoxy)thiophene-2-carboxylic acid