2,3-Bis(methylpolyoxyethylene-oxy)-1-[(3-maleimido-1-oxopropyl)amino]propyloxy propane (CAS RN 697278-30-1) with a number|average molecular weight (Mn) of at least 20|kDa whether or not modified with a chemical entity enabling a linkage between the PEG and a protein or a peptide
Restriction on entry into free circulation