Cysteine
Amino acid
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Cysteine is a semiessential proteinogenic amino acid with the formula HOOC−CH−CH₂−SH. The thiol side chain in cysteine often participates in enzymatic reactions as a nucleophile. Cysteine is chiral, but interestingly, both D and L-cysteine are... Wikipedia
Formula: C₃H₇NO₂S
Molar mass: 121.16 g/mol
3D model (JSmol): Interactive image; Zwitterion: Interactive image
Abbreviations: Cys, C
Appearance: white crystals or powder
Chiral rotation (D): +9.4° (H2O, c = 1.3)
Melting point: 240 °C (464 °F; 513 K) decomposes