Wikipedia:  

L-Methionine

Cymethion; Metionina [DCIT]; Liquimeth; 2-Amino-4-(methylthio)butyric acid, (S)-; Neo-methidin; MET; METHIONINE, L-; Methionine (VAN); L-alpha-Amino-gamma-methylthiobutyric acid; S-Methionine; Methioninum [INN-Latin]
Molecular Formula
C5 H11 N O2 S
Natural Isotopic Abundance Mass
149.2113400000
Mono-Isotopic Molecular Masses
C12N14:   149.051049293
C13N14:   154.067823481
C12N15:   150.048084186
C13N15:   155.0648583747
L-Methionine image
L-Methionine
InCHi String:
InChI=1S/C5H11NO2S/c1-9-3-2-4(6)5(7)8/h4H,2-3,6H2,1H3,(H,7,8)/t4-/m0/s1

isomeric SMILES:
CSCC[C@@H](C(=O)O)N
canonical SMILES:
CSCCC(C(=O)O)N


IUPAC
(2S)-2-amino-4-methylsulfanyl-butanoic acid



PubChem Substance (SID):   85164892   149032   3373
PubChem Compound (CID):   6137
KEGG: Compound ID   C00073
CAS Registry IDs:   24425-78-3   63-68-3   7005-18-7
PDB Chemical Component   MET   MET_LFOH
Miscellaneous Databases and IDs:   CHEBI 16643   NSC 22946   EINECS 200-562-9   CCRIS 5536   HSDB 4317   CCRIS 5528

Reference data were obtained primarily from the PubChem database.

Three dimensional molecular rendering uses Jmol.