... : C5H11NO2S 4. CAS No.: 63-68-3 L-MethionineChemical name: L-2-Amino-4-(methythio) butanoic acidMolecular formula: C5H11NO2SMolecular ... weight: 149.21Specification: L-Methionine ItemStandardAssay (on dry basis)98.5-101.5 ... on drying, %≤0.3Residue on drying, %≤0.1Application:L-Hydroxyproline, a hydroxylated form of the amino acid proline, ...