ICG-OSu

• CAT Number: I045011
• CAS Number: 1622335-40-3
• Molecular Formula: C49H53N3O7S
• Molecular Weight: 828.03
• Purity: ≥95%
• Synonyms: 4-[(2Z)-2-[(2E,4E,6E)-7-[3-[6-(2,5-dioxopyrrolidin-1-yl)oxy-6-oxohexyl]-1,1-dimethylbenzo[e]indol-3-ium-2-yl]hepta-2,4,6-trienylidene]-1,1-dimethylbenzo[e]indol-3-yl]butane-1-sulfonate
• InChI: InChI=1S/C49H53N3O7S/c1-48(2)41(50(39-28-26-35-19-12-14-21-37(35)46(39)48)32-16-8-11-25-45(55)59-52-43(53)30-31-44(52)54)23-9-6-5-7-10-24-42-49(3,4)47-38-22-15-13-20-36(38)27-29-40(47)51(42)33-17-18-34-60(56,57)58/h5-7,9-10,12-15,19-24,26-29H,8,11,16-18,25,30-34H2,1-4H3
• InChIKey: KDJUNNVUQBKNAY-UHFFFAOYSA-N
• SMILES: CC1(C(=[N+](C2=C1C3=CC=CC=C3C=C2)CCCCCC(=O)ON4C(=O)CCC4=O)/C=C/C=C/C=C/C=C\5/C(C6=C(N5CCCCS(=O)(=O)[O-])C=CC7=CC=CC=C76)(C)C)C

ICG-OSu（Cat No.:I045011）is an N-hydroxysuccinimide (NHS) ester-activated derivative of indocyanine green (ICG), designed for efficient bioconjugation to amine-containing biomolecules such as proteins, peptides, and antibodies. This near-infrared (NIR) fluorescent dye offers excellent optical properties, including deep tissue penetration and low background autofluorescence, making it ideal for in vivo imaging and diagnostics. ICG-OSu enables stable labeling under mild conditions, facilitating applications in tumor targeting, surgical navigation, and biodistribution studies. Its combination of biocompatibility, reactivity, and strong NIR emission makes it a powerful tool in molecular imaging and targeted biomedical research.