C3H8ClNO2S.H2O M.W. 175.64 Assay min 99.0%  Specific rotation 5.5o -7.0o  UV absorption max 0.1 (280nm, 1mol/l, 1cm, water) Sulphate (SO4) max 0.01% Heavy metals(as Pb) max 0.001% Ammonium(NH4) max 0.01% Foreign amino acids max 0.3% Other ninhydrin-positive substances(as glycine) max 0.1% Water 9-11.5% (Stereospecific, irreversible inhibitor of histidene, ammonia-lyase)