英文别名Febuxostat Ethyl Ester Impurity; Febuxostat Impurity 15; Ethyl 2-(3-cyano-4-isobutoxyphenyl)-4-methylthiazole-5-carboxylate; Febuxostat-7; 5-Thiazolecarboxylicacid, 2-[3-cyano-4-(2-Methylpropoxy)phenyl]-4-Methyl-, ethyl ester; Febuxostat Ethyl Ester