Spectrum Chemical manufactures and distributes fine chemicals with quality you can count on including those with CAS number 21881-18-5, Whether you call it N-Benzyloxycarbonyl-L-phenylalanyl-L-alanine, Z-L-Phenylalanyl-L-alanine , N-CBZ-Phe-Ala or Z-Phe-Ala you can be assured the N-Benzyloxycarbonyl-L-phenylalanyl-L-alanine products offered by Spectrum, meet or exceed the grade requirements or specifications for each individual product.