3-Hydroxy-4-Methyl-2(5H)-thiophenone;Cefalexin EP Impurity D;Cephalexin Impurity D (Cefradine EP Impurity F);Cefadroxil EP Impurity G (Cefradine EP Impurity F, Cephalexin EP Impurity D);Cefalexin-EP-Imp-D;Cephalexin EP Impurity D;Cefadroxil Impurity 2(Cefadroxil EP Impurity G);Cefalexin Impurity D Control