SiR-PEG4-Biotin Size:1mg CC1=C(SC=N1)C1=CC=C(CNC(=O)[C@@H]2C[C@@H](O)CN2C(=O)[C@@H](NC(=O)CCCCCCCCCN)C(C)(C)C)C=C1 Purity (HPLC) >= 95%

CC1=C(SC=N1)C1=CC=C(CNC(=O)[C@@H]2C[C@@H](O)CN2C(=O)[C@@H](NC(=O)CCCCCCCCCN)C(C)(C)C)C=C1 Purity (HPLC) >= 95% Shipping Conditions Room temperature Storage Conditions Refrigerated Shelf Life 12 months after the date of delivery Regulatory Statement For Research Use Only

68 SMILES CC1=C(SC=N1)C1=CC=C(CNC(=O)[C@@H]2C[C@@H](O)CN2C(=O)[C@@H](NC(=O)CCCCO)C(C)(C)C)C=C1 Purity (HPLC) >= 95% Shipping Conditions Room temperature Storage Conditions Refrigerated Shelf Life 12 months after the date of delivery Regulatory Statement For Research Use Only

SulfoCy5(Sulfo-Cyanine5

and exhibits excellent phot stability

SiR-PEG4-Biotin Size:1mg CC1=C(SC=N1)C1=CC=C(CNC(=O)[C@@H]2C[C@@H](O)CN2C(=O)[C@@H](NC(=O)CCCCCCCCCN)C(C)(C)C)C=C1 Purity (HPLC) >= 95%SiR PEG4 Biotin is a fluorescent tracer used in biological research that combines the far red fluorophore with biotin. Biotin is a high affinity ligand for streptavidin and avidin proteins. PEG4 linker enhances water solubility and provides spatial separation to minimize steric hindrance during binding interactions. SiR (SiR 6 COOH, 652Ex 674Em) is a far red fluorescent dye that is bright, photostable, and cell permeable, and it is fully compatible