| http://www.w3.org/ns/prov#value | - The method according to claim 1, wherein said ester compound having at least one hydroxyl group is an unsaturated aliphatic acid ester having at least one hydroxyl group; an aliphatic monoester or polyester containing at least one hydroxyl group; an aromatic ester having at least one hydroxyl group; or an alicyclic ester having at least one hydroxyl group.
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