BRANCHED HETERO-POLYETHYLENE GLYCOL AND INTERMEDIATE

摘要

Provided is a branched hetero-polyethylene glycol compound that includes two types of functional groups capable of reacting with various biofunctional substances, and in which one of said functional groups is provided in plurality. The disclosed branched hetero-polyethylene glycol is represented by formula [1]. (In the formula, X and Y each represent an atomic group containing at least a functional group that reacts with and forms a covalent bond with a functional group in a biofunctional molecule; the functional group in the atomic group (X) is different from the functional group in the atomic group (Y); s represents the number of polyethylene glycol chains and is an integer of 2 to 8; n is the average number of moles added to each polyethylene glycol chain and satisfies 20=n=2000; and E represents a branched linker moiety that has a binding valence of s to the polyethylene glycol chains and that has a binding valence of 1 to the functional group (Y).)