Name N-Acetyl L-Cysteine CAS 616-91-1 Appearance White crystals or crystalline powder Specific rotation + 21.3 -- +27.0 State of solution More than 98.0% PH 2.0 - 2.8 Loss On Drying Not more than 0.50% Chloride (Cl) Not more than 0.040% Ammonium (NH4) Not more than 0.020% Sulfate (SO4) Not more than 0.030% Iron (Fe) Not more than 20ppm Heavy metals(Pb) Not more than 10ppm Melting point 106 -- 110 C Arsenic (As2o3) Not more than 1ppm Other Amino Acids Chromatographically not detectable Residue on ignition Not more than 0.20% Assay 98.5 - 101.0% For more products,please visit our website.