4-(4-Amino-3-chlorophenoxy)-7-methoxy-6-quinolinecarboxamide is an impurity of Lenvatinib (L329400), CAS# 417716-92-8.4-(4-Amino-3-chlorophenoxy)-7-methoxy-6-quinolinecarboxamide is also used in pharmaceutical studies with an analytical role as a reference standard in an HPLC method for analyzing Lenvatinib or its salt, allowing a strong specificity, accuracy, precision, and high sensitivity.