2-(4-Methoxybenzoyl)methylene-3,4,5,6-tetrahydropyrazinone-3 3-(2-(4-Methoxyphenyl)-2-oxoethylidene)piperazinone 5-25-03-00111 (Beilstein Handbook Reference) 63656-22-4 BRN 0792359 Piperazinone, 3-(2-(4-methoxyphenyl)-2-oxoethylidene)-