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EF5 is a 2-nitroimidazole-based hypoxia marker corresponding to a pentafluorinated derivative of the hypoxic cell-radiation sensitizer etanidazole. Under low oxygen (hypoxic) condition, reductive activation of its 2-nitroimidazole moiety leads to enhanced EF5 adduct formation with protein thiols and reduced glutathione. The pentafluorination derivatization substantially decreases the proportion of low molecular weight hydrolytic fragmentation of the adducts, making EF5 superior to etanidazole when utilized as a hypoxia marker by immunohistological staining.
| Molecular Weight | 302.16 |
| Formula | C8H7F5N4O3 |
| CAS Number | 152721-37-4 |
| Solubility (25°C) | DMSO ≥ 60 mg/mL |
| Storage |
Powder -20°C 3 years ; 4°C 2 years In solvent -80°C 6 months ; -20°C 1 month |
[1] Sara I Narva, et al. Imaging of Tumor Hypoxia With 18F-EF5 PET/MRI in Cervical Cancer
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