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L-Cysteine monohydrochloride Structure

L-Cysteine monohydrochloride

Chemical Properties

Melting point 180°C
alpha  5.5 º (c=8, 6 N HCL)
storage temp.  Inert atmosphere,Room Temperature
solubility  H2O: 1 M at 20 °C, clear, colorless
form  Solid
color  White to light brown
Odor odorless
optical activity [α]20/D +6.4±0.3°, c = 5% in 5 M HCl
Water Solubility  SOLUBLE
Sensitive  Hygroscopic
Merck  14,2781
BRN  3560277
Stability Stable, but light, moisture and air sensitive. Incompatible with strong oxidizing agents, some metals.
InChIKey IFQSXNOEEPCSLW-DKWTVANSSA-N
LogP 0.235 (est)
CAS DataBase Reference 52-89-1(CAS DataBase Reference)
FDA 21 CFR 184.1272; 310.545
Substances Added to Food (formerly EAFUS) L-CYSTEINE MONOHYDROCHLORIDE
EWG's Food Scores 1
FDA UNII A9U1687S1S
NIST Chemistry Reference L-cysteine hydrochloride(52-89-1)
EPA Substance Registry System L-Cysteine hydrochloride (52-89-1)

Safety

Symbol(GHS)
Signal wordWarning
Hazard statements H315-H319-H335
Precautionary statements P280a-P304+P340-P405-P501a-P261-P305+P351+P338
Hazard Codes  Xi
Risk Statements  36/37/38
Safety Statements  26-36
WGK Germany  2
RTECS  HA2275000
3-10-23
TSCA  Yes
HS Code  29309013
Toxicity LD50 intraperitoneal in mouse: 1250mg/kg
NFPA 704:
1
2 0

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