106-57-0 2,5-DIKETOPIPERAZINE 2,5-Dioxopiperazine 2,5-Piperazinedione 5-24-05-00294 (Beilstein Handbook Reference) BRN 0112112 Cyclo(glycylglycyl) Cyclodiglycine Cycloglycylglycine Diglycolyl diamide Diketopiperazine EINECS 203-411-5 Glycine, N-glycyl-, cyclic peptide Glycine, bimol. cyclic peptide Glycylglycine lactam NSC 26345 alpha,gamma-Diacipiperazine