API
IMPURITY
CHEMICAL NAME
STRUCTURE
2
Fexofenadine Hydrochloride

EP Impurity E

 diphenyl(piperidin-4-yl)methanol Fexofenadine-Hydrochloride-EP-Impurity-E
Fexofenadine Hydrochloride

Fexofenadine Related Compound A

 (4-[1-oxy-4-[4-(hydroxydiphenylmethyl)-1-piperidinyl]butyl]-alpha,alpha-dimethyl benzeneacetic acid) Fexofenadine-Related-Compound-A
Fexofenadine Hydrochloride

Fexofenadine Related Compound B

 2-[3-[(1RS)-1-hydroxy-4-[4-(hydroxydiphenylmethyl)piperidin-1-yl]butyl]phenyl]-2-methylpropanoic acid Fexofenadine-Related-Compound-B
Fexofenadine Hydrochloride

Fexofenadine Related Compound C

 (1RS)-4-[4-(hydroxydiphenylmethyl)piperidin-1-yl]-1-[4-(1-methylethyl) phenyl]butan-1-ol Fexofenadine-Related-Compound-C
Fexofenadine N-Oxide

Fexofenadine N-Oxide

 2-(4-(1-hydroxy-4-(4-(hydroxydiphenylmethyl)piperidin-1-yl)butyl)phenyl)-2-methylpropanoic acid N-Oxide fexofenadine
Fexofenadine Methyl Ester

Fexofenadine Methyl Ester
Fexofenadine N-Oxide

Fexofenadine N-Oxide

 2-(4-(1-hydroxy-4-(4-(hydroxydiphenylmethyl)piperidin-1-yl)butyl)phenyl)-2-methylpropanoic acid N-Oxide fexofenadine
Fexofenadine Methyl Ester

Fexofenadine Methyl Ester

 Methyl 2-[4-[(1RS)-1-hydroxy-4-[4-(hydroxydiphenylmethyl)piperidin-1-yl]butyl]phenyl]-2-methylpropanoate fexofenadine methyl ester
Methyl Ester of Keto Fexofenadine

Methyl Ester of Keto Fexofenadine

 methyl 2-(4-(4-(4-(hydroxydiphenylmethyl)piperidin-1-yl)butanoyl)phenyl)-2-methylpropanoate fexofenadine1