2-Benzoylmethylene-3,4,5,6-tetrahydropyrazinone-3 3-(2-Oxo-2-phenylethylidene)piperazinone 5-24-08-00203 (Beilstein Handbook Reference) 55135-12-1 BRN 0882154 Piperazinone, 3-(2-oxo-2-phenylethylidene)-