L-Cysteine, Free Base Naturally-occurring non-essential amino acid. 产品信息 Form White solid Molar mass 121.2 Packaged under inert gas 是的 Purity ≥98% by titration (perchloric acid) Contaminants Iron: ≤10 ppm Endotoxin: ≤24 EU/g Total microorganisms: ≤100 CFU/g Heavy metals ≤0.001% (as Pb) Optical rotation Optical rotation: +8° to +9° (c = 5, 1 N HCl, 20°C). Solubility H2O Chemical formula C3H7NO2S RTECS HA1600000 CAS number 52-90-4 Merck USA index 14, 2781 商店和运输信息 Storage +15°C to +30°C Ship Ambient Temperature Only Harmful 安全标示 R Phrase R: 22;