Biotin-XX succinimidyl ester (6-((6-((Biotinoyl)amino)hexanoyl)amino)hexanoic acid succinimidyl ester) is readily coupled to a primary or secondary amine under mild conditions. The longer XX arm facilitates the interaction between biotin and avidin or streptavidin. <ul> <li>White solid soluble in DMSO and moderately soluble in DMF</li> <li>Store at -20°C</li> <li>C₂₆H₄₁N₅O₇S</li> <li>MW: 567.7</li> <li>[89889-52-1]</li> </ul>