A wound-covering agent containing a polymer having a group represented by formula (I) (wherein R1, R2 and R3 are the same or different and each represents hydrogen atom or C1-4 alkyl, and m is an integer of 2 to 4); a wound-covering material containing the preparation; and a method of wound healing which comprises the step of covering the wound of a subject with the wound-covering material to protect the wound. CHEM
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