Molecule
Name
Cysteine
IUPAC name
2-amino-3-sulfanylpropanoic acid
Secondary names
Cys, DL-Cysteine
InChI
InChI=1S/C3H7NO2S/c4-2(1-7)3(5)6/h2,7H,1,4H2,(H,5,6)
InChI key
XUJNEKJLAYXESH-UHFFFAOYSA-N
CAS number
3374-22-9
Structure and atomic composition
Formula
$HSCH_2CH(NH_2)COOH$
Chemical formula
C3H7NO2S
Structural formula
[SH][CH2][CH][NH2](C(=O)[OH])
Charge
0
  Atom Name Number
$C$ Carbon 3
$H$ Hydrogen 7
$O$ Oxygen 2
$N$ Nitrogen 1
$S$ Sulfur 1
Relations
  • enantiomer
Isotope mixture type
terrestrial abundance
Spin type
equilibrated
Molar mass
121.158 $g/mol$
State STP
solid
State NTP
solid
Protic
protic
Polarity
polar
Molecule symmetry
unknown
Case
nonlinear-polyatomic
Chemical functions
  Function Number
$R-S-H$ 1
$R-NH_2$ 1
$R-C(=O)-OH$ 1
Chemical bonds
  Bond Number
$\geq C-H$ 3
$-O-H$ 1
$>N-H$ 2
$-S-H$ 1
$\geq C-S-$ 1
$\geq C-C \leq$ 1
$\eqslantgtr C-C\leq$ 1
$\geq C-N<$ 1
$>C=O$ 1
$\eqslantgtr C-O-$ 1