| abstract |
A branched monodispersed polyethylene glycol, as shown in formula (1). (X 1 is a functional group that forms a covalent bond by reacting with a functional group present in the biofunctional molecule; n represents the number of repeating units of ethylene oxide units, and n is an integer from 4 to 50; and L 1 represents a single bond, - NH-, -L 2 -(CH 2 ) m1 - or -L 2 -(CH 2 ) m1 -L 3 -(CH 2 ) m2 -, L 2 represents ether bond, amide bond, urethane bond or mono bond, L 3 represents an ether bond, an amide bond or a urethane bond, and m1 and m2 each independently represent an integer of 1 to 5.) |