2-Piperazinone, 3,3-diphenyl-4-(2-hydroxyethyl)- 23936-09-6 3,3-Diphenyl-4-(2-hydroxyethyl)-2-piperazinone 5-24-04-00168 (Beilstein Handbook Reference) BRN 0818799 Diphenyl-3,3 (hydroxy-2 ethyl)-4 oxo-2 piperazine [French]