3-Mercaptopropanonic acid Other names: 3-Mercaptopropionic acid 3-Thiopropanoic acid Formula: C3H6O2S CAS: 107-96-0 Weight: 106,14 g/mol Boiling point: 110 (20 hPa) °C Melting point: 18 °C Density: 1,221 g/cm3