MB 680R TFP Ester is a fluroescent agent with a terminal TFP ester group. MB 680R TFP Ester very hydrophilic, water-soluble far-red fluorescent dye that has a maximal absorption of 685 nm and emission at 709 nm. The compound is pH-insensitive from pH 4 to pH 10. The TFP ester can react with primary amine groups and is also less susceptible to undergo hydrolysis compared to NHS ester. Reagent grade, for research purpose. Please contact us for GMP-grade inquiries.