| http://www.w3.org/ns/prov#value | - still preferably 1 to 16 carbon atoms, and particularly preferably 1 to 12 carbon atoms, such as mesyl or tosyl), and a heterocyclic group (including an aliphatic one and an aromatic one, preferably having 1 to 50 carbon atoms, still preferably 1 to 30 carbon atoms, and particularly preferably 2 to 12 carbon atoms, and containing at least one of oxygen, sulfur, and nitrogen, such as imidazolyl, p
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