t-boc-N-EDA, product number 10226, CAS number 57260-73-8, is the boc-protected form of ethylenediamine. PN10226 is not a dPEG® product. However, it may be useful in bioconjugation reactions. The monoprotected amine reacts with activated esters of carboxylic acids (for example, the N-hydroxysuccinimidyl ester, also known as NHS) to form amide bonds. Treatment of the resulting conjugate with acid removes the boc protecting group leaving an amine group that is free to react.