N-(2-Aminoethyl)maleimide trifluoroaceta146474-00-233 % similar Vinylcaprolactam2235-00-933 % similar N-Cyclohexylmaleimide1631-25-032 % similar 2,5-Dihydro-2,5-dioxo-1H-pyrrole-1-acetic acid25021-08-332 % similar 2,5-Dioxo-1-pyrrolidinyl 3-[2-[2-(2,5-dihydro-2,5-dioxo-1H-pyrrol-1-yl)ethoxy]ethoxy]propanoate1433997-01-331 % similar Mal-peg8-nhs ester2055033-05-931 % similar Maleimidoacetic acid N-hydroxysuccinimide ester55750-61-330 % similar