Provided is a radioactive labeled compound capable of detecting a secondary mutation of an epidermal growth factor receptor, where the compound is represented by Formula (1) or a pharmaceutically acceptable salt thereof, where R.sub.1, R.sub.2, and Y are as defined.

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The inventors have now succeeded in developing arylsulfonium salts, in particular triarylsulfonium salts and dibenzothiophenium salts and a new use of said arylsulfonium salts. These compounds have the advantage of having a thioaryl group as leaving group, which allows all side products to be separated from the radiolabelled product. Said compounds are therefore useful tools in a method for synthesizing iodo- or astatoarryl compounds, in particular radioiodo- or radioastatoaryl compounds. The present invention relates to a method for synthesizing iodo- or astatoaryl compounds comprising the reaction of an arylsulfonium compound with an iodide or astatide salt, respectively. The invention also relates to arylsulfonium compounds as such. The invention also concerns a method of synthesizing an iodo- or astatolabelled biomolecule and/or vector using said iodo- or astatoraryl compound.

The present invention generally relates to the field of dye labelled, preferably fluorescent dye labelled, radiopharmaceuticals and their use in nuclear medicine as tracers, imaging agents and for the treatment of various disease states of PSMA-expressing cancers, especially prostate cancer, and metastases thereof as well as their use in preoperative PET Imaging and Fluorescence-Guided Surgery of cancers, especially prostate cancer, and metastases thereof.

The present invention relates to deuterated compounds according to Formula I-A, Formula II-A, Formula II-D, and Formula III-A. These compounds can be used as PET imaging agents for evaluating Parkinson's Disease, Alzheimer Disease, and for determining specific serotonin reuptake inhibitor (SSRIi) activity for treatment of depression. The present invention also relates to pharmaceutical compositions comprising a pharmaceutical acceptable carrier and a compound of Formula I-A, Formulae II-A, Formula II-D, or Formula III-A, or a pharmaceutically acceptable salt thereof.