L-Cystine and L-Cysteine Base and S-Carboxymethyl-L-Cysteine and N-Acetyl-L-Cysteine
1. L-Cystine, CAS NO.: 56-89-3
Chemical Name: L-Cystine 
Molecular Formula: C6H12N2O4S2
Molecular Weight: 240.29
Characteristics: A colorless or white crystalline substance of hexagon,or crystalline powder, easily soluble in acid and alkali, insoluble in water and organic solvents such as alcohol, ethyl ether.
Packing: 25kg/drum,25kg/carton
Quality Standard: AJI92/USP28/EP5/FCCIV

2. L-Cysteine Base, CAS NO.: 52-90-4
Chemical Name: L-Cysteine Base
Molecular Formula: C3H7NO2S
Molecular Weight: 121.15
Characteristics: White crystalline powder, tasteless, easily soluble in water but insoluble in alcohol and ether.
Packing: 25kg/drum, 25kg/carton
Qualified Standard: AJI92/USP28/EP5/FCCIV

3. S-Carboxymethyl-L-Cysteine, CAS NO.: 638-23-3
Chemical Name: S-Carboxymethyl-L-Cysteine 
Molecular Formula: C5H9NO4S
Molecular Weight: 179.19
Characteristics : White crystals or crystalline powder, strongly acid taste
Packing: 25kg/drum, 25kg/carton
Quality Standard: AJI92/USP28/EP5/FCCIV

4. N-Acetyl-L-Cysteine, CAS NO: 616-91-1  
Chemical Name: N-Acetyl-L-Cysteine  
Molecular Formula: C5H9NO3S
Molecular Weight: 163.19
Characteristics: White crystals or crystalline powder , strongly acid taste
Specification: AJI92, USP24
Appearance: White crystals or crystalline powder
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