Cysteine (data page)

The complete data for Cysteine

General information

Chemical formula: C₃H₇N O₂S
Molar mass: 121.16 g·mol⁻¹
Systematic name:
(2R)-2-amino-3-sulfanyl-propanoic acid
Abbreviations: C, Cys
Synonyms:
2-amino-3-mercaptopropanoic acid
2-amino-3-mercaptopropionic acid
2-amino-3-sulfanylpropanoic acid
3-mercaptoalanine
AIDS{-}160777
CHEBI:15356
CHEMBANK2703
NSC 63864
NSC647530
NSC8746
Zystein

Database data

SMILES: SCC(N)C(=O)O
InChI=1/C3H7NO2S/c4-2(1-7)3(5)6/h2,7H,1,4H2,(H,5,6)/f/h5H

ATC: N/A

CAS: [52-90-4] ^a

DrugBank: N/A

EINECS: 200-158-2

PubChem: 5862

Physical properties

Structure

Crystal data

Spectral data

UV-Vis

NMR

Phase behavior

Solid properties

T_m: 240 °C

Liquid properties

Gas properties

Hazard properties

MSDS N/A

Main hazards:

- N/A

NFPA 704

Flash point

- N/A

R/S statement

R: N/A
S: N/A

RTECS number:
N/A

Chemical properties

XLogP: -2.988

pI: 5.07

pK_a: 1.91; 8.14; 10.28

Tautomers:

Hydrogen bond: donor - 2; acceptor - 3

Pharmacological properties

Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)

References

^a 52-90-4

The encoded amino acid

General topics

By properties

Aliphatic	Branched-chain amino acids (Valine Isoleucine Leucine) Methionine Alanine Proline Glycine

Aromatic	Phenylalanine Tyrosine Tryptophan Histidine

Polar, uncharged	Asparagine Glutamine Serine Threonine

Positive charge (pK_a)	Lysine (≈10.8) Arginine (≈12.5) Histidine (≈6.1)

Negative charge (pK_a)	Aspartic acid (≈3.9) Glutamic acid (≈4.1) Cysteine (≈8.3) Tyrosine (≈10.1)

Other classifications

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