5-FAM-PEO₈ SE (full name: 5-Carboxyfluorescein-PEO₈ propionate succinimidyl ester) has an approximately 32 Angstrom water-soluble PEG spacer that separates fluorescein and the amine-reactive SE group. <ul> <li>&lamba;_Ex/&lamba; _Em(pH9) = 494/521 nm</li> <li>Yellow orange solid soluble in DMF, DMSO, or pH 6.5 buffer</li> <li>Store at -20°C and protect from light</li> <li>C₄₄H₅₂N₂O₁₈</li> <li>MW:896.89</li> </ul>