2-Amino-5-thiazolecarboxylic Acid Ethyl Ester-13C3,15N2 is an intermediate in synthesizing 2-Chloro-5-thiazolecarboxylic Acid-13C3,15N (C411468), an isotopically labeled analog of 2-Chloro-5-thiazolecarboxylic Acid (C411465). It was studied as one of the metabolites of thiamethoxam, clothianidin, and dinotefuran in mice.