OMPI;1-(2-Mercaptoethyl)-4-phenyl-2-imidazolidinone;2-Oxo-3-(2-mercaptoethyl)-5-phenylimidazolidine;DL-2-Oxo-3-(2-Mercaptoethyl)-5-phenyliMidazolidine;1-(2-Mercaptoethyl)-4-phenyliMidazolidin-2-one;Levamisole EP Impurity C;2-Imidazolidinone, 1-(2-mercaptoethyl)-4-phenyl-;Levamisole Impurity 3（Levamisole EP Impurity C）
