头孢羟氨苄杂质3; 头孢氨苄EP杂质D; 头孢氨芐杂质; 头孢氨芐杂质G; 头孢拉定杂质F; 头孢羟氨苄EP杂质G; 头孢拉定EP杂质F; Cefalexin EP Impurity D; Cephalexin Impurity D (Cefradine EP Impurity F); Cefadroxil EP Impurity G; 4-hydroxy-3-methyl-2H-thiophen-5-one; 3-Hydroxy-4-methylthiophen-2(5H)-one; Cefradine EP Impurity F (Cefalexin EP Impurity D); cefalexin Impurity G