3-(Methylthio)-propionaldehyde Other names: Methional 3-Methylsulfanyl-propionaldehyde 3-(Methylthio)-propanal Formula: C4H8OS CAS: 3268-49-3 Weight: 104,17 g/mol Boiling point: 165 °C Melting point: -75 °C Density: 1,041 g/cm3