| abstract |
Branched monodispersed polyethylene glycol represented by formula (1). (X1 is a functional group that reacts with a functional group present in a biofunctional molecule to form a covalent bond; n is an integer of 4-50 and represents the number of repeating units of ethylene oxide units; L1 represents a single bond, -NH-, -L2-(CH2)m1-, or -L2-(CH2)m1-L3-(CH2)m2-; L2 represents an ether bond, an amide bond, a urethane bond, or a single bond; L3 represents an ether bond, an amide bond, or a urethane bond; and m1 and m2 each independently represent an integer of 1-5.) |