2-[4-(4-Chlorobutyryl)phenyl]-2-methylpropionic acid methyl ester, with CAS number 154477-54-0, is also known as Methyl 2-(4-(4-chlorobutanoyl)phenyl)-2-methylpropanoate. It's a pharmaceutical intermediate, specifically an impurity standard of elagolix, a medication used to treat endometriosis and uterine fibroids
 
 
Applications: Intermediate used in the production of Fexofenadine