Structure Formula:CH3SCH2CH2CH(NH2)COOH Molecular Formula:C5H11NO2S Molecular Weight:149.21 Characteristics:White flake crystal powders, have a special smell, bulk density 1.34g/cm 3 , melting at 281ºC, It's soluble in water, slightly soluble in alcohol, belongs of sulfur amino acid and non-toxic. Quality Standards:EP4, FCCIV , USP24