Intracellular thiols play vital roles in living systems, and their in situ monitoring is of great importance. Here, we report on a bioorthogonalchemistry based fluorescent probe, which is capable of monitoring intracellular thiols in livingcells for up to 36 hours with an obvious blue-to-green fluorescence change.
The invention relates to the fields of peptide mimetics and pharmacy. The invention provides novel cycle forming linkers and bicyclic peptide mimetics prepared therefrom. The linkers comprise an organic moiety P, leaving groups X1 and X2 at benzylic positions, and a reactive group Q capable of participating in a linking reaction. The organic moiety P contains an aromatic (hetero) cycle, an aliphatic heterocycle comprising a positively charged nitrogen atom, and a neutral nitrogen atom.