| http://www.w3.org/ns/prov#value | - If the thiol-modified monomer of the present invention is produced by the above-mentioned synthesis method (ii), thiocarboxylic acid such as thioacetic acid and thiobenzoic acid is added to a compound including a double bond such as an allyl group at both ends of a polyalkylene glycol (hereinafter, also referred to as a ???starting compound 2???) and then the obtained product is subjected to an al
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