The invention is concerned with novel substituted piperidine derivatives of formula (I) wherein R1, R2, R3, R4, R5, R6, R7 and X are as defined in the description and in the claims, as well as physiologically acceptable salts and esters thereof. These compounds inhibit L-CPT1 and can be used as medicaments.本發明係關於式(I)之新穎經取代之六氫吡啶衍生物以及其生理學上可接受之鹽及酯:其中R1、R2、R3、R4、R5、R6、R7及X如說明書中及申請專利範圍中所定義。此等化合物抑制L-CPT1且可用作藥物。