High Purity Glycyl-l-glutamine Monohydrate

We are famous manufacturer of High Purity Glycyl-L-Glutamine Monohydrate in Weihai, Shandong, China with the following details:
Appearance:White or almost white crystals or crystalline powder
Mr:221.22
Optical rotation:-5.5A ~-7.5A
Chloride:0.02%
Ammonium:0.02%
Iron:0.001%
Sulfate:0.02%
Arsenic:0.0001%
Residue on ignition:0.1%
Related substances(HPLC):GLy 1.0%, Gln+Glu 0.5% ;
Cyclo (Gly-gln) 0.2% ;
Pyroglutamic acid 0.2%
Not indentified impurities (HPLC) :single 0.1% ;sum 0.5%
Assay (titration): not less than 99%