| http://www.w3.org/ns/prov#value | - Preferred groups A are aliphatic C1 -C6 alkyl groups, in particular ethyl and isopropyl, furthermore cyclohexyl and in particular C1 -C6 alkyl which is substituted by a heterocyclic group, where the heterocyclic group is preferably a radical of a five-membered heterocyclic ring containing one or two ring members other than carbon, in particular --NH--, in particular a radical of imidazole, maleimi
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