N-Acetylsulfanilyl Chloride (ASC) Enterprise standard Q/UAD of Wugan Pharmaceutical Co., Ltd. of Suzhou Q/320584 UAD004-2011 Appearance: White of off-white crystalline powder Content: ≥98.0% Moisture: ≤0.5% Acidity: ≤0.5 Acidity (After placed 180 days) : ≤1.0 Melting point: 143-147℃