Piperazine-2,3-dione13092-86-9100 % similar N1,N2-Bis(2-hydroxyethyl)ethanediamide1871-89-261 % similar N1,N2-Diethylethanediamide615-84-950 % similar 2-Imidazolidone hemihydrate121325-67-542 % similar 1-Ethyl-2,3-piperazinedione59702-31-737 % similar N1,N2-Dimethylethanediamide615-35-033 % similar Oxalyldihydrazide996-98-533 % similar 4-Piperidinone41661-47-630 % similar