| Alias: | Cysteine, L-; L-(+)-Cysteine; L-Alanine, 3-mercapto-; L-Cys; NSC 8746; L-Cysteine; (+)-2-Amino-3-mercaptopropionic acid; L-beta-mercaptoalanine; L-Cysteine Free Base Crystalline; (S)-(-)-Cysteine; L-Cysteine Base; H-Cys-OH | 
| CAS: | 52-90-4;4371-52-2 | 
| EINECS: | 200-158-2 | 
| Molecular formula: | C3H7NO2S | 
| Molecular weight: | 121.15 | 
| InChI: | InChI=1/C3H7NO2S/c4-2(1-7)3(5)6/h2,7H,1,4H2,(H,5,6)/t2-/m0/s1 | 
| Molecular structure: |  | 
| Melting point: | 220℃ | 
| Water solubility: | 280 g/L (25℃) | 








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