MB 660R Acid is a fluroescent agent with a terminal carboxylic acid group. It is a very hydrophilic, water-soluble, far-red fluorescent dye that has a maximal absorption of 665 nm and emission at 690 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.
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