Spectrum Chemical manufactures and distributes fine chemicals with quality you can count on including those with CAS number 6217-68-1, Whether you call it p-Nitrophenyl Sulfate Potassium Salt, Sulfuric Acid Mono(4-nitrophenyl) Ester Potassium Salt or Potassium p-Nitrophenyl Sulfate you can be assured the p-Nitrophenyl Sulfate Potassium Salt products offered by Spectrum, meet or exceed the grade requirements or specifications for each individual product.