Fmoc-Lys(CR110)-OH is a green fluroescent molecule with two Boc protecting groups and terminal carboxylic acid and Fmoc moieties. The protected amines can be deprotected under mild acidic conditions. It has an excitation at 502 nm and emission at 527 nm. The terminal carboxylic acid can react with primary amine groups in the presence of activators (e.g. HATU) to form a stable amide bond. The Fmoc group can be deprotected under basic conditions to obtain the free amine which can be used for further conjugations.
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