Spectrum Chemical manufactures and distributes fine chemicals with quality you can count on including those with CAS number 501-53-1, Whether you call it Benzyl Chloroformate, Carbobenzoxy Chloride , CBZ-Chloride or Chloroformic Acid Benzyl Ester you can be assured the Benzyl Chloroformate products offered by Spectrum, meet or exceed the grade requirements or specifications for each individual product.