1-Butyl-2,3-piperazinedione 2,3-Piperazinedione, 1-butyl- 2385-28-6 4-Butyl-2,3-dioxopiperazine 4-Butyl-2,3-piperazinedione 5-24-05-00288 (Beilstein Handbook Reference) BRN 0743883