(1-Ethyl-piperidin-3-yl)-carbamic Acid tert-Butyl Ester is an intermediate in the synthesis of 4-Amino-N-(1-ethyl-3-piperidinyl)-5-(ethylsulfonyl)-2-methoxybenzamide (A609495), which is an impurity of Amisulpride (A633250). Amisulpride EP Impurity G.