API
IMPURITY
CHEMICAL NAME
STRUCTURE
2
Febuxostat

Febuxostat Amide Impurity

2-(3-Carbamoyl-4-isobutoxyphenyl)-4-methylthiazole-5-carboxylicacid Febuxostat-Amide-Impurity
Febuxostat

Febuxostat Ethyl Ester Impurity

Ethyl2-(3-cyano-4-isobutoxyphenyl)-4-methylthiazole-5-carboxylic acid Febuxostat-Ethyl-Ester-Impurity