beta-naphtholsulfonic acid

be·ta-naph·thol·sul·fon·ic ac·id (ba″tə-naf″thol-sul-fonґik) white pearly scales tinged with red, OH·C₁₀H₆SO₂·OH, used as a test for albumin in the urine; it is a toxic drug that causes profound narcotism and symptoms resembling diabetic coma and is not used as a medication.