外观appearance white powder 核磁Proton NMR spectrum Conforms to Structure 水溶性solubility clear colorless solution at 50mg/ml of water 纯度Purity ≥98.0% (HPLC) 水分water by karl fischer ≤10 % Em (259nm,Phosphate Buffer,pH 7.0) >14700 钠sodium by ICP-atomic emission 8.3% to 8.9%