The present invention relates to compounds of the formula I,wherein X, R, R1, R2, D, E1, E2, E3, E4, G1, G2, G3 and G4 have the meanings indicated in the claims, which are valuable pharmaceutical active compounds. They are inhibitors of the protease cathepsin A, and are useful for the treatment of diseases such as atherosclerosis, heart failure, renal diseases, liver diseases or inflammatory diseases, for example. The invention furthermore relates to processes for the preparation of the compounds of the formula I, their use and pharmaceutical compositions comprising them.本發明係關於式I化合物,其中X、R、R1、R2、D、E1、E2、E3、E4、G1、G2、G3及G4具有在申請專利範圍中所指出之意義,其係有價值的醫藥活性化合物。其係組織蛋白酶A之抑制劑且可以用於治療疾病例如動脈粥樣硬化症、心臟衰竭、腎病、肝病或發炎性疾病。本發明還關於式I化合物之製備方法、其用途及含其之醫藥組成物。