1-Ethyl-2,3-piperazinedione 1-Ethylpiperazine-2,3-dione 2,3-Piperazinedione, 1-ethyl- 4-Ethyl-2,3-dioxopiperazine 4-Ethyl-2,3-piperazinedione 5-24-05-00286 (Beilstein Handbook Reference) 59702-31-7 BRN 0879076 CCRIS 8931 EINECS 261-866-5 P 32 T 1982C