The molecule is an organosulfonic acid that consists of phthalide bearing four bromo substituents at positions 4, 5, 6 and 7 as well as two 4-hydroxy-3-sulfophenyl groups both located at position 1. It has a role as a dye. It is a member of 2-benzofurans, an organobromine compound, an organosulfonic acid and a member of phenols. It derives from a 2-benzofuran-1(3H)-one. It is a conjugate acid of a bromosulfophthalein(2-).
2-hydroxy-5-[4,5,6,7-tetrabromo-1-(4-hydroxy-3-sulfophenyl)-3-oxo-2-benzofuran-1-yl]benzenesulfonic acid