Also available in 1 mg, 10 mg, 25 mg, 50 mg, 100 mg and bulk. Please contact Fisher for quotes. Cyanine5 NHS ester chloride is a reactive dye with red fluorescence that requires a small amount of organic cosolvent (such as DMF or DMSO) to label amino groups in peptides, proteins, and oligonucleotides. Purity 99.06%