The invention relates to a precursor for a [18F]-labeled PET tracer for imaging of Alzheimers Disease, its synthesis and the process for preparing the respective [18F]-labeled PET tracer.本發明係關於一種用於阿茲海默氏病(Alzheimers Disease)造影之經[18F]標記之PET示蹤劑的前驅物,其合成法,及製備對應之經[18F]標記PET示蹤劑之方法。(無元件符號說明)