Thioglycolic acid (CAS No. 68‑11‑1; formula HSCH₂COOH; MW ~92.12 g/mol) is a clear, colorless, odor‑intense liquid with ≥ 98% purity in lab-grade form Ataman Chemicals+7PubChem+7MilliporeSigma+7. It melts around –16 °C, boils near 96 °C at reduced pressure, and functions as a strong reducing agent and ligand.