Spectrum Chemical manufactures and distributes fine chemicals with quality you can count on including those with CAS number 106-57-0, Whether you call it Glycine Anhydride, 2 -5-Diketopiperazine or 2 -5-Piperazinedione you can be assured the Glycine Anhydride products offered by Spectrum, meet or exceed the grade requirements or specifications for each individual product.