2-04-00-00791 (Beilstein Handbook Reference) 36724-51-3 BRN 1805844 Glycine, N,N'-(1,4-dioxo-1,4-butanediyl)bis-, diethyl ester N,N'-(1,4-Dioxo-1,4-butanediyl)bisglycine diethyl ester