中文名字：L-胱氨酸

Product Name:L-Cystine
Synonyms:(R,R)-3,3'-Dithiobis(2-aminopropionicacid)
Molecular Formula: C₆H₁₂N₂O₄S₂
CAS #:56-89-3

Test Items	Standard
Appearance	White crystals or crystalline powder
Assay	98.5% to 100.5%
Specific Rotation [醈20/D	−217.8? c = 1 in 1 N HCl
Loss on Drying	8.5% to 12.0%
Residue in Ignition (Sulfate)	Not more than 0.10%
Chloride (Cl)	19.89% to 20.29%
Heavy Metals (Pb)	Not more than 10 PPM