2-(4-Chlorobenzoyl)methylene-3,4,5,6-tetrahydropyrazinone-3 3-(2-(4-Chlorophenyl)-2-oxoethylidene)piperazinone 5-24-08-00203 (Beilstein Handbook Reference) 63656-20-2 BRN 0790483 Piperazinone, 3-(2-(4-chlorophenyl)-2-oxoethylidene)-