| http://www.w3.org/ns/prov#value | - polyethylene glycol compound is not particularly limited, and an example thereof is a compound having the following structure: R1???[???O???(R3???O???)m???R2]n [0182] wherein R1 represents a polyhydric alcohol residue or a polyhydric phenol residue; R2 represents a hydrogen atom, or an alkyl, alkenyl, alkynyl, alkyloyl, aryl, or aryloxy group, each of which may have a substituent having 1 to 25 c
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