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Soluble in DMSO or DMF. Flamma(R)675 is bright and stable near-infrared (NIR) fluorescent dye that features high water solubility and low toxicity. It has a similar optical spectrum to Alexa Fluor(R)680, Cy5.5, DyLight(R)680, IRDye(R)680LT. Near-infrared fluorescent dye is mainly used for In-Vivo Imaging in drug delivery and tumor research, as it is highly permeable to biological tissue. Flamma(R)675 NHS ester is a product that has the most representative NHS ester reactive group for labeling amine. Because it rapidly and high-specifically reacts to Primary amine (-NH2), it can label Protein containing amine (-NH2), Antibody and Amine-modified Oligonucleotide in a short time period. Excitation ? Emission (nm): 675 / 691 nm. Spectrally similar dyes: Alexa Fluor(R)680, Cy(R)5.5, DyLight(R)680, CFT680, IRDye(R)680LT. Extinction coefficient: 220,000 cm-1M-1. CF280: 0.09.