This invention relates to novel compounds suitable for labelling or already labelled by18F, methods of preparing such a compound, compositions comprising such compounds, kits comprising such compounds or compositions and uses of such compounds, compositions or kits for diagnostic imaging by positron emission tomography (PET).本發明係關於適用於經18F標記或業經18F標記之新穎化合物,製備此化合物之方法,包含此等化合物之組合物,包含此等化合物或組合物之套組,及此等化合物、組合物或套組藉由正電子發射斷層攝影術(positron emission tomography;PET)進行診斷成像之用途。